Thurber junco (Oregon snow bird) on nest. Image note: front view.

Thurber junco (Oregon snow bird) on nest. Image note: upright plate, thin.

Nest of an eared grebe, uncovered.

Nest of an eared grebe, uncovered.

William L. Finley in a tree photographing a great blue heron nest. A young bird is perched on a branch nearby.

Pyrrhuloxia sitting in nest with open mouth. Image note: 3/4 front view, large size.

Pyrrhuloxia on nest with mouth open. Image note: side view, large size, clear.

Cactus wren nest in a cholla cactus with four eggs. Entrance enlarged.

Two very young golden eagle chicks in nest. Image note: telephoto, second series.

Phainopepla nest containing two eggs in the fork of a mesquite tree.