Question

Crows are intelligent animals. They can use tools and communicate with each other quite well. A recent study may have proven these birds are even smarter than scientists originally believed. Researchers wanted to find out how crows responded to human beings in their environment. To do this, researchers recorded the voices of five people the crows had never heard before. The crows reacted more to the unknown voices. Researchers believe unfamiliar voices may pose more of a threat to the crows. This may explain why the crows reacted.

Crows ________ different human voices

A. imitate
B. Confuse
C. distinguish
D. avoid

Answer 1

C. distinguish

The passage says the crows reacted more to unfamiliar voices, implying they can tell different human voices apart.