A young common egret in its nest.

Three common egret chicks in their nest. Image note: side view, close up.

Three common egret chicks in their nest. Image note: side view, close up.

Two common egret chicks in their nest. Image note: side view, close up.

Common egret chick in nest.

Common egret chick in nest.

Common egret chick in nest.

Hand-colored, unmounted lantern slide of a Parkman’s wren perched on a stump with food in bill. Nest entrance showing below. Original negative: OrgLot369_FinleyA1566.

William L. Finley in a tree photographing great blue heron nests. A young heron is perched on a branch nearby. Image note: rear lens.

An unidentified man photographing a great horned owl perched in its nest on a saguaro cactus. A ladder is leaning against the side of the cactus.