Black Howler Monkey

The Black Howler Monkey (Alouatta caraya) is a species of howler monkey from northeastern Argentina, eastern Bolivia, eastern and southern Brazil, and Paraguay.  Only the adult male is black; adult females and juveniles of both genders are overall whitish to yellowish-buff.
They live in groups of usually seven to nine.  Their "dawn chorus" sounds much more like roaring than howling, and it announces the howlers' position as a means of avoiding conflict with other groups. The call can be heard up to 5 km away.