Male plumbeous gnatcatcher on the edge of nest after feeding young.

Male plumbeous gnatcatcher on the edge of nest after feeding young. Image note: side view.

Male plumbeous gnatcatcher on the edge of nest in cholla cactus. Location note: beyond university.

Male plumbeous gnatcatcher on the edge of nest after feeding young. Image note: tail blurred.

Male plumbeous gnatcatcher on the edge of nest after feeding young. Image note: side view, good.

General view of a cholla cactus showing the nest of a cactus wren.

General view of a cholla cactus showing the nest of a cactus wren.

Cactus wren nest in a cholla cactus. Adult cactus wren perched near entrance with food for young.

Plumbeous gnatcatcher nest in a cholla cactus.

William L. Finley standing with his camera in the back of the buggy photographing a plumbeous gnatcatcher nest in a cholla cactus.