Strong Little Legs

It is so easy to take for granted the amazing physical capabilities of songbirds. Some of our species have astonishing strength in their feet and we almost don't notice. Most can perch on a tree branch, lock their digits, and sleep without falling! Most can grasp the most unpromising surfaces and cling the first time. And quite a few can hang even upside down (as this wren is doing) --and feed-- without a second thought. I don't think I could hang upside down, holding on only with my toes, and eat my supper. Nor could I hold on too long in any position save upright! They may be small, but the birds have serious strength!