Monkey
Monkeys are a species of primates native to jungle and desert regions of Equestria. They're playful little creatures, who apparently tend to steal valuables from ponies.
Fiction
Friendship is Magic
Monkeys appeared on the map of the Forest of Leota in the "Here there by monkeys" portion.The Return of Queen Chrysalis - Part II
Equestria Girls
An unnamed Monkey was a resident of the Desert Island and ally to the Girl Pirates. It was reenacted by Pinkie Pie, who gave it a hyper energetic and fun-loving personality. According to Lily Pad, it was taught tool tricks by the Girl Pirates after they became good friends.Pinkie Sitting