If you’ve ever chimney swifts in flight, you know these birds are spectacularly fast and graceful fliers. They have to be because they forage on the wing, capturing enough tiny biting insects each day to equal one third of their body weight! Their feet are not designed for perching the way other birds perch. Instead, they’re more like grappling hooks, enabling them to grip vertical surfaces like the insides of large hollowed out old trees, tree … [Read more...]