Howler monkey is a new world primate represented by two species (Alouatta seniculus et Alouatta Macconnelli). You can see the Macconnelli species in the zoo which is native to Surinam, Trinidad, Brazil and Guyana. He has got a characteristic howling that made be possible thanks to a hollow bone inside the neck, a kind of resonance chamber. He uses his prehensile tail like as easy as a hand to ensure the grip.