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There's a small jungle of cholla, palo verde trees and small mesquite trees on the levee behind our house.
There are the remains of old nests in the jumping chollas. On Sunday morning, I spotted the beginnings of a new nest.
Later on I went back to investigate further and found the nest-builder, a Curve-billed Thrasher, Toxostoma curvirostre. In the Sonoran Desert, Curve-billed Thrashers live where mesquite or cholla cactus is present, in shrubby areas, open brushy woodland, and around towns.
Curve-billed Thrashers quite commonly build their nests in jumping chollas. They build a deep cup of twigs, lined with grasses or other fine materials. They lay three to five bluish-green eggs, spotted with reddish-brown.I watched the Thrasher constructing more of the nest. It didn't seem to be at all concerned about my being nearby.
I watched it until it flew away.