Herman T. Bohlman climbing to a red-tailed hawk's nest in winter.

View of a tree showing a red-tailed hawk's nest and Herman T. Bohlman at nest.

Two young rufous hummingbirds in nest in spirea in south Portland.

Two young rufous hummingbirds in nest in spirea in south Portland.

Two young rufous hummingbirds in nest in spirea in south Portland.

Two young rufous hummingbirds in their nest on a fir limb in south Portland.

A young rufous hummingbird in its nest in a rose bush. Taken by Dr. Kellogg.

Two young rufous hummingbirds side by side in their nest under a bridge in south Portland.

Two young rufous hummingbirds side by side in their nest under a bridge in south Portland.

Two young rufous hummingbirds in their nest on a fir limb in south Portland.