In the height of summer, we hear birds in the trees singing their bright, warm songs, and we watch them take flight in the humid air. But in the deep of winter, sometimes the only sign of our feathered friends is the nest they left behind, revealed when the shelter of leaves fell away, well before the first snowfall conceals the nest once again. These carefully constructed bird cradles are gorgeous in their paradoxical glory: so delicately arranged, yet so sturdy, adamantly holding their place on winter branches.