In the world of squirrel researchers, Stephanie Preston, a professor of psychology at the University of Michigan, is a bit of a legend. “She’s the one that actually discovered the head flick and it ...

Add Yahoo as a preferred source to see more of our stories on Google. A close-up of a gray squirrel on the forest floor holding a large acorn in its paws with soft sunlight in the background.© A-Z ...

Clearly, the gray squirrel was spending only a few seconds on each acorn. The animal removed the cap with its lower incisors, then proceeded to chip away at the outer shell and the nutritious kernel ...