Adult cactus wren just entering entrance to nest.

Adult cactus wren about to enter nest. Image note: partially blurred.

Adult cactus wren at entrance of nest. Image note: back view, not very good.

Adult cactus wren about to enter nest with food. Image note: side view, very good.

Palmer thrasher just leaving nest in cholla cactus. Image note: shadow on body.

Herbert Brown standing beside a cholla cactus looking at a Palmer thrasher nest.

Female plumbeous gnatcatcher sitting on the edge of a nest in a cholla cactus.

Verdin nest on the limb of a cholla cactus.

Old road-runner sitting on edge of nest in cactus. Image note: side view, negative cracked and repaired.

Cactus wren nest showing four eggs. Nest is partially torn away from cactus.