In One Wild Bird at a Time, Heinrich returns to his great love: close, day-to-day observations of individual wild birds. Heinrich’s observations lead to fascinating questions – and sometimes startling discoveries. A great crested flycatcher bringing food to the young acts surreptitiously and is attacked by the mate. Why? A pair of Northern flickers hammering their nest-hole into the side of Heinrich’s cabin delivers the opportunity to observe the feeding competition between siblings, and to make a related discovery about nest-cleaning. One of a clutch of redstart warbler babies fledges out of the nest from twenty feet above the ground, and lands on the grass below. It can’t fly. What will happen next?