What adaptation do Diana monkeys use in their vocalizations?

Diana monkeys exhibit a sophisticated adaptation in their vocalizations by altering their calls based on the specific predator attack strategies they encounter. This ability reflects their advanced cognitive skills and social communication, allowing them to convey crucial information to other members of their group. For instance, the context in which a predator is present influences the type of alarm call used, enabling the other monkeys to respond appropriately to varying threats. This adaptation enhances their survival by facilitating effective responses to different predatory situations.

In contrast, the other alternatives do not accurately capture the complexity of Diana monkeys' vocal communication. Simplifying alarm calls would not provide the nuanced information necessary for group survival against various predators. Mimicking human sounds is not a behavior observed in Diana monkeys, as their natural vocalizations are adapted specifically to their environment and social interactions rather than human communication. Lastly, not differentiating between predator types would significantly reduce their chance of survival, as different predators often require different responses, which is contrary to what has been observed in these monkeys.