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Pattern IA has a single transition zone, where eggs predominantly hatch males if incubated below this temperature zone, and predominantly hatch females if incubated above it. Pattern IA occurs in most turtles , with the transition between male-producing temperatures and female-producing temperatures occurring over a range of temperatures as ...
Egg incubation is done under favorable environmental conditions, possibly by brooding and hatching the egg. Multiple and various factors are vital to the incubation of various species of animal. In many species of reptile for example, no fixed temperature is necessary, but the actual temperature determines the sex ratio of the offspring.
Nevertheless, the success rate of the eggs is relatively low, with only a handful of eggs from each clutch resulting in a live turtle. Hatchling snapping turtles are barely the size of silver dollars.
In sea turtles, hatchling sex is determined by incubation temperature. [8] In species in which eggs are laid then buried in sand, indentations in the sand can be a clue to imminent hatching. [9] In sea turtles, this usually occurs about 60 days after the laying of eggs, and often at night. [10]
She lays 10–25 or more eggs in one or more clutches. Eggs are ellipsoidal, approximately 1.5 inches (4 cm) long. Incubation time is determined by temperature, but averages 90–100 days. Hatchlings generally emerge in August or September. There have been reported instances of late clutches over-wintering and hatching in the spring.
When a hatching sea turtle first pokes its head above the sand and scrambles to the sea, a watching child might ask how the turtle knows where to go and how girl turtles know to come back one day ...