Mammalia (Mammals) is a class of cynodonts. There are 5978 species of mammals, in 1700 genera and 557 families. This class has been around since the middle triassic epoch. They includes groups like Monotremes. Reproduction is dioecious.
EOL has data for 18 attributes, including:
The environments in which many mammals species are known to live. Select an environment to see its mammals species checklist.