Dark-eyed junco

The male arrives in the nesting area in April, a few days before the female, and sounds a joyful trill from a tree top to attract her. He displays his white tail feathers as part of the courtship ritual. The parents become very agitated whenever the nest is approached, making it easy to find. But the hatchlings quickly develop a tarsus (a bone in the foot), helping them to run away from enemies even before they learn to fly.