MammalsMammals are a class of species that regulate their body temperature internally. Except for monotremes, the young are born live and suckle milk from the female. Most have some hair or fur on their body.
Mammal species profiles
Fish & MarineFish are any scaly vertebrate animal that lives in water. Unlike mammals and birds, the body temperature of most fish is regulated by the ambient temperature of their environment.
Fish species profiles
ReptilesReptiles are of the class Reptilia. They lay eggs and their skin is covered with scales. They are often referred to as "cold-blooded" because unlike "warm blooded" mammals they cannot regulate their own body temperature internally. Instead their body temperature is determined by the ambient temperature of their environment.
Reptile species profiles