The Vesper Sparrow population has been in decline in the Eastern U.S. due to habitat loss. It is still common in the West however.
It prefers meadows, prairies, and fields. It is most easily seen along dirt back country roads.
The Vesper Sparrow forages on the ground looking for insects and seeds. It will eat beetles, grasshoppers, caterpillars and moths. Seeds are of weeds and grasses.
This photo was taken in San Rafael Valley east of Patagonia.