Palmer thrasher nest in a cholla cactus.

Palmer thrasher sitting on nest in cholla cactus. Image note: shadows on bird.

Palmer thrasher entering nest in a cholla cactus. Image note: shadows on bird.

Palmer thrasher on edge of nest. Image note: large size, shadow across body, taken from blind.

Palmer thrasher nest and three eggs in a cholla cactus.

Female plumbeous gnatcatcher on edge of nest feeing her young. Image note: upright plate.

Female plumbeous gnatcatcher sitting on edge of nest after feeding young. Image note: side view.

Female plumbeous gnatcatcher standing in nest with wings spread to protect young bird from the sun.

Female plumbeous gnatcatcher sitting on edge of nest with food for her young. Image note: upright plate.

An unidentified man standing at the base of a saguaro cactus looking up at a red-tailed hawk’s nest in the top of the cactus.