Bolivian gray titi (Callicebus donacophilus)

The Bolivian gray titi is a monkey found in the tropical forests of Bolivia, Brazil and Paraguay. These monkeys feed on leaves, fruits and anthropods and rely on song-like calls for communication.

Titi monkeys form life-long pairs. A pair is rarely more than a few yards apart and do almost everything together, even sitting against each other with their tails intertwined in one long braid.