Not really expecting to get "research grade" on this observation, but this is a known location for a small breeding/resident group of this species.
San Diego County, California, US
On lawn after sprinkler run
The Crissal Thrasher (Toxostoma crissale) is a large thrasher found in the Southwestern United States to central Mexico. The bird grows to 32 cm (12.5 inches), and has a deeply curved bill. It can be found near desert streams in dense underbrush, and in the low desert near canyon chaparral. The bird seldom flies in the open.