6. Douroucouli

The Douroucouli otherwise known as owl monkeys or night monkeys are the only true nocturnal species on monkey in the world. Its common to think of other species of monkeys to be nocturnal but usually its the twilight periods where most species are active whereas these night ninjas truly make the night their own. Although these monkeys are nocturnal they certainly aren’t going to keep themselves hidden for long as they are extremely musical boasting over eight distinct calls. The Douroucouli can be found in south America and sometimes in the central regions and you will definitely hear them before you see them!