You won’t see a chickadee shoveling out a parking space and claiming it with a folding chair, no matter how good your binoculars are. But birds, too, have to be resourceful when they live in inhospitable climates. Travel just 600 meters up a mountain, and you’ll find chickadees vastly more clever than their peers living a more comfortable life below.
How do you test the cleverness of birds? Using tubes with tasty worms inside, naturally. Biologists don’t like to call animals “smart,” thou