Many mammals are clearly related. Domestic cats, for example are like very small lions. Horses, zebras and donkeys are all related. How many basic kinds of mammal are there? What are their characteristics? When did they first appear in the fossil record? This display answers those questions.
What are the limits of relatedness?
Click on one of the different mammal kinds, listed below, for more information.
Names in brown indicate all families in the kind are extinct.
Names in blue indicate kinds with families that are alive today.
