This Hi-Tech Bird Feeder Lets Clever Magpies Exchange Bottle Caps for Food
You might not realize it, but birds are very intelligent creatures. Crows, for instance, can recognize human faces. Magpies, a relative of crows, are also known for their smarts as well as their affinity for picking up objects and finagling with things like locks. Artificial intelligence researcher Hans Forsberg noticed these clever creatures around his neighborhood and was able to train them to trade in pieces of litter for food.