A pig is classified as an ungulate because it has hooves. It is classified as an artiodactyl also because it has an even number of toes.

An artiodactyloid is an artiodactyline (artiodactyl-like) humanoid creature. It is also any animal similar to an artiodactyl (i.e. pigs, sheep, deer, cattle, etc.).

If aliens exist, some alien races could possibly have artiodactyl characteristics, such as pigs, sheep, deer, cattle, etc.

An anthracothere is any of a number of extinct artiodactyl ungulates of the family Anthracotheriidae, which are related to the hippopotamus.

An artiodactyle is a member of the Artiodactyla, a group of ungulates.