英语时差：鸟类的认知地图（上）

When you find yourself in a new town, you probably walk around it a few times in order to figure out where things are in relation to other things! In a little while it becomes easy. That process is sometimes called “constructing a cognitive map.” Cognitive maps are just what they sound like: a mental version of the town you can consult in order to better get around in the real town. Now,here's a question.Do Birds Do This? Probably not, you might say. They’re just birds. But then, they navigate very well. Maybe so! Does anyone know? Psychologist Alan Kamil of the University of Nebraska wanted to find out. He did some experiments on a species known as Clark’s nutcracker. These birds bury seeds for later, and show great ability at finding their stashes again from the air.