The California Quail is a ground-feeding bird of brushy areas in the western United States with a head plume that curves forward. Its belly has a black-and-white pattern that looks like scales. It is also called the Valley Quail.
Check the belly: California Quail have clear black and white scaling. Gambel's Quail (Callipepla gambelii) have a plainer buff belly, with a black patch on males.
Why they get mixed upBoth have a forward curling head plume.