Question

read it! 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 who regularly fed a group of crows. they also recorded voices of 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. do it! crows ____ different human voices. a imitate b confuse c distinguish d avoid

Explanation:

The text states that crows reacted more to unknown voices than familiar ones. This shows they can tell the difference between different human voices. "Distinguish" means to recognize differences.

Answer:

C. distinguish