Antipredator Behavior of Brown Howlers Attacked by Black Hawk-eagle in Southern Brazil

In field studies between 2002 and 2004 in southern Brazil, we recorded antipredatory behaviors (N=9) of brown howlers (Alouatta guariba clamitans) under attack by the black hawk-eagle (Spizaetus tyrannus). We observed 2 types of behavioral responses: the descent to the understory followed by the dispersion of the group and immobility and silence. Brown howlers displayed behaviors specific to evading aerial predators, which are similar to the ones in other Neotropical primates.The article is contribution number 1578 of Departamento de Zoologia, Universidade Federal do Paraná