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