Yellow-headed blackbirds like to hang out in marshes, fields, or open country areas. They eat insects such as beetles, caterpillars, or grasshoppers. They also eat seeds from grass or weeds. They forage by walking in the ground, although sometimes they will catch insects in flight. Read more about this blackbird here: BLACKBIRDS (part 1). I found this yellow-headed blackbird in the Garland Prairie area in northern Arizona.