Many reptiles lay eggs, but not all of them do. Some snakes and lizards give live birth, and reproductive strategies vary widely across turtles, crocodilians, lizards, snakes, and tuatara. A broad statement such as “reptiles lay eggs” leaves out a great deal of that diversity.
Eggs and nests are not all alike
Reptile eggs may be leathery or more rigid, and nests can be underground, in vegetation, on open sand, or in other protected sites. Incubation time, clutch size, and parental involvement are species-specific. Some reptiles guard nests or brood eggs; many do not remain after nesting.
Temperature and sex
Temperature-dependent sex determination occurs in some reptiles, including all crocodilians, most turtles, and some lizards. It is not universal, and the temperature-to-sex relationship differs among species. It should not be reduced to a single “warmer means” rule or used as generic home-incubation advice.
Leave wild nests alone
Wild eggs can be harmed by handling or turning. If a nest is in danger, contact the relevant wildlife authority or a licensed rehabilitator rather than attempting to incubate or relocate it yourself.
