They are Old World monkeys and most have tails.

New World species form monogamous pair bonds, and show substantial paternal care of their young, unlike most Old World monkeys.

Unlike humans and most Old World monkeys, their thumbs are not opposable (except for some Cebids).

The grivet (Chlorocebus aethiops) is an Old World monkey with long white tufts of hair along the sides of the face.

The yellow baboon, Papio cynocephalus is a baboon in the family of old World monkeys.

De Loys counted 32 teeth (most New World monkeys have 36 teeth), and noted that the creature had no tail.

The lion-tailed macaque (Macaca silenus) is an Old World monkey.

Many Old World monkeys have tails, but those tails are never prehensile.

Hanuman langurs (or gray langurs) are an Old World monkey found in India.

Most Old World monkeys are at least partially omnivorous, but all prefer plant matter, which forms the bulk of their diet.