This female ran toward the snake, also vocalizing, and hit it with her hands several times, but the snake did not react and she moved off to a nearby tree from where she watched most of the interaction.
The only group member to respond to the distress vocalization emitted by the victim was the other adult female, which was closest to the location where the attack occurred. The howler was swallowed head-first in 76 min. The boa applied the species’ typical hunting behavior of striking and immediately coiling around its prey and then killing it through constriction (probably in less than 5 min), but the entire restraint period lasted 38 min. 2.5-ha forest fragment in the State of Rondônia, western Brazilian Amazon. The victim belonged to a group composed of six individuals (one adult male, two adult females, two juveniles, and one infant) that inhabited a ca. 2-m-long Boa constrictor in an arboreal setting at a height of 7.5 m above the ground. Here, we report the first documented case of successful predation of an atelid by a snake-an adult female Purús red howler monkey, Alouatta puruensis, that was subdued by a ca. Among New World primates, reports of snake predation are limited to medium- and small-bodied species. Primates from all major radiations are particularly susceptible to raptors, carnivores, and snakes. Reports of successful predator attacks on primates are rare.
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