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

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

An adult Vigor's wren with food at the entrance to its nest on the side of a stump in Fulton Canyon.

An adult Vigor's wren with food at the entrance to its nest on the side of a stump in Fulton Canyon.

Two young Vigor's wrens on an alder branch in Fulton Canyon. One bird is blurred.

Adult Parkman’s wren at entrance to nest in stump. A second Parkman’s wren on the top of stump about to start flying.

Young Parkman’s wren sitting in the entrance to its nest. Image note: large size.

Adult Parkman's wren perched on top of a stump with food in bill. Image note: side view.

Adult Parkman’s wren perched on top of a stump with food in bill. Image note: side view.

Young Parkman’s wren looking out of its nest hole. Image note: side view.