Reproductive biology

Most iguanids lay eggs, but a few give birth to live young. These include some Phrynosoma, Sceloporus, and Leiolamus species, as well as Corytophanes percarinatus. The number of eggs ranges widely. Many iguanids, such as the green anole (A. carolinensis), lay only one or two eggs at a time, but others lay dozens. The horned lizard (P. cornutum) commonly lays 24 eggs, but the number sometimes reaches more than

36 per clutch. A green iguana female may lay more than 60 eggs at a time.

In many species, optimal environmental conditions can spawn additional clutches. For example, some Dipsosaurus, Crotaphytus, and Gambelia species that live in cooler climates have only one clutch each year, while warmer-climate populations may have two, three, four, or more clutches.

Parental care among most iguanids is either nonexistent, or is restricted to simply burying the eggs or engaging in short-term nest guarding. The iguanines are most known for nest guarding. The rhinoceros iguana (Cyclura cornuta cor-nuta), for example, lays from two to nearly three dozen eggs, then tenaciously guards her nest for several days. The Jamaican iguana (Cyclura collei) guards her nest for up to two weeks. Among the iguanines, nest-guarding behaviors may range from displays to physical attacks.

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