Abstract
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.
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