Female phainopepla sitting on the edge of a nest in mesquite tree while young birds beg to be fed.

Pyrrhuloxia sitting on nest. Image note: side view, large size.

Two young phainopepla birds in nest.

Two young phainopepla birds in nest.

Vermilion flycatcher nest and three eggs on limb of a mesquite tree. Image note: upright plate.

Lucy warbler nest and three eggs in bark of a mesquite tree.

Lucy warbler nest in bark of a mesquite tree. No eggs showing.

Pyrrhuloxia sitting in nest with open mouth. Image note: small size.

Pyrrhuloxia sitting in nest with open mouth. Image note: small size.

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