Exploring Prime Nesting Zones

Proximity to Water Sources

Crocodile nesting zones are rarely far from the water’s edge. The Nile crocodile, common across South Africa, selects sandy banks and dry riverbeds that remain within easy reach of deep water. This proximity is not optional; it is survival. A female must hear hatchlings calling from inside the eggs and then guide them to the shallows within minutes of emergence.

What fascinates me most is how the distance from water affects temperature regulation. Nests too close to the river risk flooding during summer rains, while nests too far expose eggs to predators and heat stress. Female crocodiles often return to the same general area each season, using their memory of water levels and bank structure to decide where crocodile lay eggs.

• Stable sand or soil that holds warmth
• Shaded spots that prevent overheating
• Access to quiet backwaters with minimal current

These conditions shape where crocodile lay eggs each breeding season, and understanding them helps land managers protect critical habitats across South Africa’s waterways.

Vegetation Density and Cover

Few things expose the hidden logic of a crocodile’s world like the vegetation surrounding a nesting site. The dense, impenetrable thickets of reeds and pioneer grasses that line South Africa’s riverbanks are not random chaos. They are the architecture of concealment. For a female moving inland to deposit her clutch, these green barriers function as a veil against the watchful eyes of monitors and other nest raiders. This cover locks in humidity, a critical variable for egg survival, and it is within these shaded pockets that we truly understand where crocodile lay eggs.

The texture of this vegetation matters more than casual observers assume. A nesting female will often seek out areas where robust root systems stabilize the soil. This structural integrity prevents the nest from collapsing during heavy storms. It creates a microclimate where temperature fluctuations are moderated by the organic debris above. When you see a clearing that is oddly well kept amidst the wild growth, you are likely looking at a site curated by the crocodile herself. She is not merely picking a spot. She is engineering a nursery.

A prime nesting zone consistently exhibits these vegetative markers:

– A canopy of low hanging branches or tall grass that blocks intense midday sun.
– A layer of leaf litter that decomposes and generates sustained warmth.
– Physical barriers that break the wind and reduce surface evaporation.
– Root masses deep enough to anchor the bank against a sudden surge of water.

The presence of this vegetation density dictates the rhythm of the breeding season. In areas where erosion has stripped the flora bare, nesting attempts fail. The eggs bake under the relentless sun or become easy targets. Conversely, the presence of specific plant species, such as the buffalo grass and wild tamarisk, signals a stable bank that has held firm for years. This is why old nesting grounds are reused. The vegetation regrows in a pattern that the crocodile recognizes, guiding her back to the precise patch of earth that offers the most protection. It is a profound symbiosis, where the plant life and the reptile’s cunning converge to dictate the future of the species.

Substrate Composition and Drainage

The ground beneath a nesting crocodile tells its own story, one written in sediment and stone. Substrate composition dictates whether a clutch survives or suffocates. Sandy loams hold the perfect balance, allowing oxygen to reach the developing embryos while retaining enough moisture to prevent desiccation. Pure clay compacts too tightly, trapping deadly carbon dioxide. Loose gravel drains too quickly, leaving eggs parched. I have watched females test potential sites with their snouts, probing for that elusive middle ground where texture meets function.

Drainage patterns determine the difference between a nursery and a watery grave. A nest positioned in a slight depression captures rainfall, but excessive pooling drowns the embryos within hours. The ideal slope allows water to percolate through the mound at a measured pace, never saturating the egg chamber. Seasonal flooding events that transform riverbanks into temporary islands also reshape this calculus. Crocodiles instinctively select elevated terraces, those ancient alluvial benches that have survived decades of monsoonal rage.

A prime nesting zone requires these specific substrate features:
– Particle sizes ranging from fine sand to small pebbles that maintain structural integrity
– Organic content below 15%, preventing excessive heat generation during decomposition
– A hardened crust that resists predator digging while remaining penetrable to hatchlings
– Subsurface layers that remain consistently moist without becoming waterlogged

The interaction between rainfall and soil chemistry creates chemical signatures that experienced females recognize. Calcium carbonate deposits indicate stable banks that have not shifted in generations. Iron oxide staining suggests periodic inundation, a warning sign that wise mothers heed. When I examine a successful nesting site, I find a substrate that has been curated over centuries, each layer telling a history of floods, droughts, and the slow accumulation of minerals. This is the hidden architecture of survival, the precise arrangement of earth and water that determines where crocodile lay eggs and whether those eggs will ever see the sun.

Sunlight Exposure and Temperature Gradients

Temperature determines the destiny of a crocodile clutch. Nile crocodile eggs incubated at 𝟯𝟮 degrees Celsius hatch as males, while those at cooler or warmer temperatures emerge as females. So the exact patch of sun a female selects shapes the sex ratio of her offspring.

Understanding where crocodile lay eggs requires reading the sun’s path across the seasonal savanna. Females observe the sun’s arc for days before choosing a site! They prefer northern-facing slopes where morning light gathers earliest. Soil thermal conductivity matters as much as air temperature. Dark, loamy banks absorb heat quickly but release it fast at night. Pale sands reflect sunlight but store warmth slowly. Crocodiles seek a top layer of sun-baked crust atop cooler, moist deeper strata.

• Morning sunlight exposure for three to four hours, initiating embryonic development
• Afternoon shade preventing lethal overheating above 34 degrees Celsius
• Soil depth approaching half a meter, insulating eggs from night-time chill

Such exacting requirements tie each clutch to a particular temperature range, further refining the map of where crocodile lay eggs across the watercourses of South Africa.

Habitats Across the Globe

Riverine Systems and Sandbars

Across the globe, riverine systems dictate where crocodile lay eggs. The Nile crocodile in Africa, the mugger in Asia, and the American crocodile in the Americas all fixate on the same feature: a raised sandbar that stays above water throughout incubation.

Sandbars are transient. Each wet season reshapes them, cutting new channels and depositing fresh sediment. Yet crocodiles return to familiar reaches year after year.

– The Zambezi delivers coarse, well-drained sand to mid-channel islands.
– The Okavango exposes new bars as seasonal floodwaters recede.
– The Limpopo offers narrow banks with steep drop-offs.

A river’s rhythm is the deciding factor. A site that works one season may vanish the next, and crocodiles adapt to that uncertainty.

Swamps, Marshes, and Wetlands

Swamps and marshes hold a different kind of promise for nesting crocodiles. In these wetlands, the substrate is often peat or muck, which retains heat and moisture differently from sand. The seasonal pulse of floodwater creates shallow, isolated pools that protect nests from terrestrial predators.

Consider the places where crocodile lay eggs in wetland systems:

• the papyrus swamps of Lake Victoria
• the flooded grasslands of the Sudd
• the mangrove marshes of the Sundarbans

Each site offers a matrix of channels and hummocks. I have watched females excavate nests on raised tussocks, often within a meter of open water. Water levels here fluctuate slowly, so a nest that is too low may drown, while one too high becomes vulnerable. This delicate balance is the defining challenge of wetland nesting.

Coastal Estuaries and Mangrove Lagoons

Coastal estuaries and mangrove lagoons present a different set of constraints for nesting crocodiles. The tidal cycle dictates everything. Females must choose sites where the high tide will not inundate the eggs, yet moisture from tidal seepage keeps the substrate from baking hard.

I have observed nests tucked among the pneumatophores of Avicennia mangroves, where the root network creates natural cavities. These locations offer consistent temperatures and protection from monsoonal surges.

Key factors in these habitats include:

• Tidal amplitude and frequency
• Soil salinity levels
• Distance from tidal creeks

In South Africa’s estuarine systems, the St Lucia wetlands remain a critical site. The precise locations where crocodile lay eggs in these lagoons shift annually with sediment movement and cyclonic events. A nest that succeeds one season may be completely unsuitable the next.

Man-Made Canals and Artificial Embankments

Across the globe, human engineering has inadvertently created new nesting sites. In Florida’s network of drainage canals, female crocodiles excavate cavities along sloped banks where the spoil material offers a rare combination of drainage and stability. I have observed nests on the artificial embankments of South Africa’s irrigation schemes, where the compacted clay retains enough moisture without becoming waterlogged.

These structures present different constraints. The angle of repose, the rate of water level fluctuation, and the presence of riprap all determine where crocodile lay eggs. A canal that appears ideal in winter may flood catastrophically after summer storms!

• Proximity to maintenance traffic
• Thermal mass of concrete or asphalt
• Stability of the bank under erosion

In the Okavango Delta’s man-made channels, the seasonal drawdown exposes fresh banks each year, yet the crocodiles return to the same artificial terraces, suggesting a learned fidelity to these constructed sites.

Island Beaches and Remote Atolls

Across the Indo-Pacific, remote atolls force nesting crocodiles into a brutal trade-off. Saltwater crocodiles swim hundreds of kilometres from mainland estuaries to reach island beaches where mammalian predators cannot follow. The question of where crocodile lay eggs on these narrow landmasses depends on elevation and substrate. Coral rubble mixed with sand drains rapidly, while decomposed vegetation supplies the heat needed for incubation. Beach ridges sitting above the spring tide line become the only viable nesting zones.

• Ridges of coral shingle that retain warmth overnight
• Pockets of humus beneath dune grasses
• Distance from the prevailing swell direction

These sites are not safe havens. A single cyclone can strip the island bare, and rising sea levels now threaten the very beaches where crocodile lay eggs! Yet the animals persist, returning annually to the same dunes despite the risks.

Underground Burrows and Cave Entrances

Underground burrows offer a hidden alternative for species that shun open nesting grounds. The dwarf crocodile of Central Africa digs nesting tunnels into clay banks, extending metres from the water’s edge. These chambers hold steady humidity and shield eggs from fires. Cave entrances serve a similar purpose. In limestone, Nile crocodiles deposit eggs in shallow recesses where geothermal warmth stabilises incubation.

Such sites alter the usual answer to where crocodile lay eggs. The mother excavates a chamber, deposits the clutch, then backfills the entrance. This hides the nest from aerial predators, though monitor lizards dig down.

• Burrows range from 0.5 to 2 metres
• Cave nests sit within 10 metres of water
• Underground incubation runs cooler than open nests

I find this strategy the most secretive. The female visits no nest, challenging the common assumption of where crocodile lay eggs. Floods pose the greatest danger; a rising water table drowns the eggs.

Seasonal and Environmental Triggers

Rainfall Patterns and Flooding Cycles

Rainfall patterns act as a primal clock for crocodiles. In the wild, the first heavy downpours soften the earth and signal the precise moment for nesting. Flooding cycles determine which banks remain accessible, as rising waters can either expose fresh sandbars or drown existing nests. This is where crocodile lay eggs becomes a delicate gamble against nature’s unpredictability.

A sudden surge after a dry spell often triggers mass nesting events. Conversely, excessive floods force females to delay or relocate. Consider the following triggers:

– Prolonged dry periods that concentrate prey and stabilize nesting grounds
– Early seasonal rains that saturate soil without submerging it

These cycles have shaped crocodilian instincts over millennia. I find it remarkable how a single storm can rewrite the entire reproductive schedule across a river system. The balance between too little and too much moisture defines survival.

Water Level Fluctuations

In the lower reaches of the Okavango, the answer to where crocodile lay eggs is dictated by the falling water line. As seasonal floods recede, they expose a fresh, moist bank. This precise window is non-negotiable. The females target these newly emerged terraces because the substrate is still soft enough to excavate, yet high enough to avoid the coming dry season’s lowered water table.

The rate of drawdown changes the play. A rapid drop leaves steep, unstable embankments. A slow, steady decline creates broad, flat nesting zones.

Here is how the phases typically unfold:
1. Primary flood peak saturates the floodplain.
2. Water stabilizes, depositing fine silt.
3. Recession begins, exposing firm sandbars.
4. Females scout and dig within days of exposure.

This constant flux forces the reptiles to be opportunists. In regulated rivers downstream of dams, the water levels are erratic. The sudden release of water for agriculture can flood a nest that was safely placed weeks prior. Conversely, a lack of release leaves the sandbanks baked and hard. For the crocodile, the water level isn’t just a backdrop, it is the very boundary of where crocodile lay eggs. They read the gauge, and they gamble on the next phase.

Temperature-Dependent Sex Determination

Seasonal triggers extend beyond water. The temperature of the nest determines the sex of the hatchlings. Crocodile eggs incubate in darkness, buried deep within the earth. Cooler nests produce females. Warmer nests produce males. The margin between them is narrow and unforgiving.

The nesting season aligns with the hottest months, when the sun beats down on exposed banks. A nest shaded by vegetation might yield a brood of females, while a sun-scorched mound yields males. The difference comes down to degrees.

• Below 31°C, the clutch leans female.
• Above 32°C, the clutch leans male.
• Extremes above 34°C prove lethal.

This is why the question of where crocodile lay eggs holds such consequence. The choice of where crocodile lay eggs dictates the temperature, and the temperature dictates the future. A single degree of seasonal variation can tilt an entire generation.

Nesting Window Across Species

The nesting window is not a fixed calendar date. It shifts with environmental triggers that vary by latitude and species. In South Africa, the Nile crocodile typically nests during the dry season, when receding waters expose fresh banks. The slender-snouted crocodile, however, prefers shaded forest streams and nests later once seasonal rains stabilise water levels.

Different species respond to different cues:

• Photoperiod and thermal accumulation signal the start of gravidity.
• Barometric pressure shifts precede nesting events in some populations.
• The presence of suitable substrate acts as the final trigger.

These staggered windows mean the question of where crocodile lay eggs changes as the season progresses. A bank that suits one species in September may be underwater by November. The choice of where crocodile lay eggs must align with local conditions that favour incubation, and each species has refined its timing accordingly.

Impact of Drought and Extreme Weather

Drought reshapes the landscape and alters where crocodile lay eggs. As surface water retreats, exposed banks appear promising, but they may dry out before incubation ends. Hardened clay and cracked mud become unusable, forcing females to dig deeper or abandon a site entirely.

Extreme weather delivers a separate threat. A sudden cyclone can flood a low-lying sandbar within hours, drowning a clutch before the mother returns. A heatwave can bake the upper layers of a nest, denaturing embryos that would have survived a milder season.

These conditions create a hierarchy for nesting females:

1. Drought compresses available territory, heightening competition for the few shaded banks that hold moisture.
2. Extreme heat shortens the digging window as exposed soil loses water rapidly.
3. Storm surges erase entire nesting cohorts, leaving elevated sites as the only refuge.

Behavioral Rituals of Deposition

Scouting and Site Preparation

A female crocodile does not stumble upon a nesting spot by accident. She scouts with deliberate care, returning to potential sites over several days to test their worthiness. Once she settles on a location, she performs a quiet sequence of clearing and shaping, using her hind legs to scrape away debris and her snout to test the soil’s firmness.

1. She circles the the site at dawn to check for disturbances.
2. She excavates a shallow depression with sweeping motions.
3. She packs the surface with her body, pressing down to compact the substrate.

These rituals are part of crocodile motherhood, and they determine where crocodile lay eggs with precise, methodical care.

Nest Construction Techniques

The actual deposition is a quiet, deliberate act. A female arches her body over the depression and lowers her cloaca toward the ground. She releases eggs one by one, often catching each with ahind foot to guide it gently into place. It is a slow process, but in less than an hour she can lay 40 eggs. The entire ritual depends on precise body positioning; a single wrong shift could crack a shell.

Once deposition ends, nest construction begins immediately. She uses her hind legs to pull sandand soil over the eggs, creating a mound. Her snout becomes a trowel, pushing material into gaps. This is where crocodile lay eggs: inside the mound, insulated by layers of packed earth. She repeatedly presses her body weight onto the mound to compact it, then drags a forelimb across the surface to check firmness. For many species, the mound regulates temperature and moisture for the developing embryos.

Consider the mechanics: not all crocodiles nest alike. Some build elevated mounds of vegetation and mud; others dig simple holes. But each female finishes by tamping down the exterior to hide any trace. She may also scatter dry leaves over the site. By the time she leaves, no visible sign of where crocodile lay eggs remains.

Egg Laying Process and Timing

Under the cover of darkness, most crocodilian mothers begin the delicate process of deposition. The timing is rarely accidental. In the heat of the South African summer, when the midday sun bakes the riverbanks, females wait for the relative cool of the evening or the early morning hours to lay their eggs. This schedule prevents the eggs from overheating while they are exposed and vulnerable.

The act itself is a masterclass in precision. The female, having scouted her location, digs a hole with her hind legs. She then arches her body and deposits the clutch directly into the chamber. A typical clutch size varies significantly, but for the Nile crocodile, it often ranges from 25 to 80 eggs. She carefully covers them, using her snout to smooth the sand and her body to tamp it down, leaving barely a trace of her activity.

To understand the full ritual, consider the specific phases a mother goes through:

1. Site Selection: She chooses a spot with the right balance of shade and sunlight, often returning to the same general area year after year.
2. Digging: Using her powerful hind legs, she excavates a flask-shaped hole deep enough to protect the eggs from temperature swings and predators.
3. Deposition: The eggs are laid in layers, separated by soil, which helps maintain consistent humidity and temperature.
4. Concealment: After covering the nest, she may roll over the top to smooth it out, making it harder for monitors and other scavengers to locate.

This entire sequence, from the first scratch to the final pat-down, can take over an hour. The effort is exhaustive, but it determines the survival of the next generation. The location of the nest dictates the incubation temperature, which in turn determines the sex of the hatchlings. That is why the answer to the question of where crocodile lay eggs is not just about geography; it is about the specific thermal properties of that patch of earth, a detail the mother assesses with an instinct honed over millennia.

Camouflage and Nest Concealment

After deposition, the mother crocodile does not leave. She conceals the nest with systematic movements. Her hind legs kick sand into the chamber, and her snout smooths the top. She then crawls over the area, compressing the substrate. These actions ensure that where crocodile lay eggs remains a secret. Some females drag branches or grass across the site. Others dig decoy holes nearby to divert predators.

• Sweeping soil with the snout to level the mound.
• Flattening surrounding vegetation to reduce visual cues.
• Using urine or musk to confuse scavengers that rely on smell.

Each movement is purposeful. A disturbed nest invites scavengers. If the location is discovered, incubation fails. The mother’s final patrol around the nest is the last protection her offspring receive.

Parental Vigilance and Guarding

The critical work doesn’t end when the final egg is placed. The location where crocodile lay eggs becomes a focal point for constant maternal attention. The female remains in a state of heightened alertness, often positioned within a meter or two of the mound. She does not sleep soundly. Her eyes track movement along the water’s edge and through the reeds. This vigilance is not passive.

– She responds to low-frequency vibrations through her jaw, detecting approaching footsteps.
– She performs regular perimeter sweeps, circling the nest at dusk and dawn.
– She uses her body to block direct sunlight from the mound during peak heat.

Any sudden noise triggers a defensive posture. A monitor lizard near the site is met with a lunging snap of her jaws. Humans passing too closely receive a throaty hiss. This guarding phase is a waiting game. The mother loses significant body mass during this period, but the preservation of the brood outweighs her own needs. For many species, this dedication ensures the next generation has a chance to emerge. The hidden chamber, once a simple hole in the ground, becomes a defended fortress until the first chirps signal the hatchlings’ arrival.

Abandonment and Post-Laying Movements

After the final egg drops, maternal behaviour can change quickly. Some crocodile mothers reverse the guarding script and abandon the mound within hours, often triggered by flood warnings or human disturbance. The female circles once, presses the nest flat with her snout, then slides away. The spot where crocodile lay eggs is left to its own fate. That final exit is a ritual in itself, a deliberate break from the site.

• Immediate return to the main water body after nest compaction
• Short range shifts to dense reeds for concealment
• Rare visits to the mound during the incubation phase

Post-laying movements follow established corridors, not random drift. The mother returns to deep water, or maybe a shaded mud wallow. She may revisit the nest within a few days, but only to assess condition, not to protect. The location where crocodile lay eggs becomes a point of departure, not residence.

Species-Specific Nesting Preferences

Nile Crocodile – Riverbank Specialists

A single Nile crocodile female may return to the same stretch of riverbank for decades, if left undisturbed. This is where crocodile lay eggs for many populations along the Limpopo, Olifants, and Pongola rivers. The Nile crocodile is a riverbank specialist, and its nesting choices are far more particular than they appear.

She seeks banks with a certain structure. The ideal site offers a layered profile of sand and clay, shaped by seasonal floods yet stable enough to hold a nest cavity. She tests the soil by scratching with her hind claws. If the bank crumbles too easily, she moves on.

A Nile crocodile’s preferences are visible in her choices:

• She selects banks with moderate slope, not sheer cliffs and not flat plains.
• She avoids banks with dense tree roots, which can entangle her nest.
• She favors the upper third of the riverbank, above the high-water mark.

This pattern holds true even as river courses shift.

Saltwater Crocodile – Coastal and Estuarine Nesters

A saltwater crocodile can travel hundreds of kilometers by sea, but she returns to the same estuary to nest. This is where crocodile lay eggs for the species Crocodylus porosus, the largest living reptile. Unlike the Nile crocodile’s riverbank cavities, the saltwater crocodile builds mound nests from vegetation and mud. She selects sites in tidal rivers, mangrove creeks, and sheltered coastal bays.

Her nesting preferences follow a clear pattern:

• She chooses elevated ground within the mangrove fringe, above the daily high-water mark.
• She avoids open beaches and exposed shorelines where waves can wash away the nest.
• She favors locations with abundant plant matter, which decomposes and generates heat.

The coastal environment offers a unique incubator. The mound’s organic material breaks down and warms the eggs from within, supplementing the tropical sun. This matters because the nest’s temperature determines the sex of the hatchlings. A female saltwater crocodile may reuse a successful mound site for years, or she may build a fresh mound nearby. This is where crocodile lay eggs in a landscape defined by tides and storms. A single cyclone or king tide can destroy an entire clutch. The female’s preference for elevated, sheltered spots is her primary defense, and it explains where crocodile lay eggs in coastal environments. She balances the need for humidity against the risk of flooding, selecting ground that drains well yet retains enough moisture for the eggs.

American Crocodile – Mangrove and Brackish Sites

The American crocodile, Crocodylus acutus, nests in mangrove and brackish sites along coastlines from Florida to South America. She digs a hole nest in sand or soil, unlike the mound building coastal species. The female selects ground above the high tide line, often hidden among red mangrove roots.

Brackish lagoons and tidal mangrove forests offer the correct balance of salinity and shade. The female probes several spots before digging. She presses her snout into the substrate to test drainage and moisture. This ritual determines where crocodile lay eggs for this species.

• Elevated sand shelves near deep channels
• Shaded clearings inside mangrove thickets
• Soil with enough sand to drain but enough clay to hold shape

High salt tolerance extends the nesting range into coastal zones where competitors cannot survive. These factors reveal where crocodile lay eggs across the species’ range.

Mugger Crocodile – Freshwater Marsh Dwellers

The mugger crocodile, Crocodylus palustris, stakes its claim in freshwater marshes across the Indian subcontinent. Unlike the mangrove specialists, this species thrives in shallow, vegetated wetlands where water levels shift gently with the seasons. The female builds a mound nest from mud and decaying plant matter, often on a raised platform that stays dry during normal flooding.

To pinpoint where crocodile lay eggs for muggers, look for dense reed beds and floating vegetation mats. These spots offer concealment from predators and maintain steady humidity for incubation. The female constructs her nest in the late dry season, timing the hatch to coincide with monsoon rains.

• Isolated marsh islands
• Edges of oxbow lakes
• Thick stands of elephant grass

Each site provides structural support and thermal regulation. The mugger’s strict reliance on freshwater sets it apart from estuarine nesters. This habitat selection directly shapes where crocodile lay eggs throughout their range.

Dwarf Crocodile – Rainforest Leaf Litter Nests

Deep within the shaded rainforests of West and Central Africa, the dwarf crocodile follows a different nesting path. This smallest of crocodilians does not heap mud or sand into an open mound. Instead, she scrapes away the leaf litter to form a shallow basin, then covers her clutch with decaying leaves and plant matter.

These nests rely on the slow heat of decomposition rather than direct sunlight. The female selects sites with thick overhead canopy and moist, well-drained soil, usually near the slow-moving blackwater streams she hunts in. Where crocodile lay eggs for the dwarf species is often concealed beneath fallen palm fronds and root tangles.

• Steep stream banks with loose organic soil
• Raised hummocks around swamp forests
• Natural depressions under large buttress roots

The parent stays close until the rains trigger hatching, then leads the young toward shallow pools. This leaf litter strategy keeps eggs hidden from monitor lizards and other nest raiders.

Orinoco Crocodile – Seasonal Island Scrapes

The Orinoco crocodile stakes its claim on seasonal island scrapes. When the river retreats, sandbars surface and the females move in. They choose elevated, dry banks with fine sand that drains quickly after rain.

The scrape is shallow. The female digs with her hind legs, laying 20 to 40 eggs into the depression before covering them with loose sand and surface grit.

Where crocodile lay eggs for this species depends on timing. The islands must remain dry through incubation, and the sun must hit the sand hard enough to hold steady temperatures.

Some preferred island characteristics include:

– Exposed position with no vegetation shade
– Sand that compacts firmly but drains fast
– Proximity to deeper water for a quick retreat

The female stays near the scrape, watching from the river edge, until hatching begins.