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.

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

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

Steller's jay nest and eggs in a fir tree.

Gambel’s sparrow nest and eggs. Taken in Jennings woods.

Vermilion flycatcher nest and three eggs on limb of a mesquite tree.

Bullock’s oriole nest and eggs. Nest opened on side.

California jay nest and four eggs.