Primates Have Been Observed to Make Calls in the Presence

Multiple Choice

Primates have been observed to make calls in the presence of various other species. For example, vervets call when they detect baboons, unfamiliar humans, snakes, or leopards. This is because they

A) want to attract the other species so they can hunt them.
B) want to demonstrate their ability to recognize other species and, in this manner, attract mates.
C) are highly territorial and are defending their resources.
D) are selected to warn other members of their own group of the presence of these potentially dangerous animals.