Here is a list of some of the Minecraft Mobs.

Chicken, cow, mooshroom, ocelet, pig, sheep, squid, villagers, skeleton jockey, enderman, wolf, zombie pigman, blaze, cave spider, creeper, ghast, magma cube, silverfish, skeleton, slime, spider, zombie, snow golem, iron golem, mutant enderman, mutant creeper, mutant zombie, and bull.