Think Squirrels are Smart? Try Crows
The real answer is a bird, not a mammal. It turns out that dolphins donít have the biggest brains relative to their bodies; crows do.
There have been a lot of studies showing how crows use tools to get what they want. But now crows have moved on in adjusting to modern life.
See what this crow, living in a city in Japan, does when he wants to open a nut that is too hard for him to crack. Are we as clever?
Photo credit: law keven