Young Gambel's sparrows in their nest.

A Bullock oriole feeding young at nest in willow.

A Bullock oriole feeding young at nest in willow.

Four young meadowlarks in nest.

Four young meadowlarks 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 with a camera on a tripod under a rock ledge photographing Sierra hermit thrush chicks in their nest near Paradise River in Mount Rainier National Park.

A camera on a tripod under a rock ledge set up to photograph Sierra hermit thrush chicks in their nest near Paradise River in Mount Rainier National Park.