Most conspicuous in desert shrubby areas in the winter, large flocks of Brewer\'s Sparrow feed on the ground and low bushes for seeds. They often move with other sparrow species, such as White-crowned Sparrows and Black-throated Sparrows. During the summer pairs set up territories in Sage Brush and higher altitude dry shrub areas, where they feed largely on insects and spiders. They can go for almost a month without water, evidently making water from the seeds they eat.
The four-digit banding code is BRSP.