Reptiles are vertebrates, which means they have a vertebral column and, in most cases, two pairs of limbs. Most are oviparous: the young develop in eggs laid (and sometimes incubated) by the mother, breaking the shell to come out. Their skin consists of scales made of keratin, which is waterproof. Reptiles are cold-blooded animals. They are ectothermic, which means they absorb heat from outside rather than producing it themselves. Most reptiles are endangered because of the degrading of their habitat by human advances and agriculture.

Nile crocodile (Africa, Madagascar)

With all crocodilians, the gender of the young is determined by temperature. Nests with a temperature less than or equal to 30° produce females, those around 31° produce young of either sex, and those with a temperature of more than 32° produce males. The Nile crocodile is the most common crocodilian in Africa. It regularly exceeds 4 meters in length.

Green iguana (South america)

Lizards are the most widespread reptiles, with more than 5,000 known species. They can be found on all continents except Antarctica. Green iguanas are tree-dwelling and eat mainly leaves and fruit.

Giant Aldabra tortoise (Seychelles)

Testudines comprise marine and freshwater turtles and land-dwelling turtles. Giant Seychelles tortoises can weigh up to 250kg. Females lay a maximum of 25 eggs. Endemic to Aldabra atoll in the Seychelles, this species is listed as vulnerable on the IUCN’s Red List.

Boa constrictor (Central and South America)

There are more than 3,400 snake species. Boa constrictors belong to the Boidae family. They are non-venomous, instead suffocating their prey by rolling themselves around them, then swallowing them. Females keep eggs in their genital tracts until they hatch and give birth to fully formed young.