Shefeldt's junco nest with four eggs. Note on envelope credits image to Alex Walker.

Shefeldt's junco nest with four eggs. Note on envelope credits image to Alex Walker.

Shefeldt's junco nest with four eggs. Note on envelope credits image to Alex Walker.

Thurber junco (Oregon snow bird) on nest with open mouth. Image note: contrasty plate.

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

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

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

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

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

Thurber junco (Oregon snow bird) in nest with mouth open. Image note: dense plate, plate turning yellow.