Chickadees, verdin, bushtit, nuthatches, creeper, wrens, gnatcatchers, and wrentit make up this grouping of small, plump, active brown or gray birds found in wooded and brushy habitats. All are insect-eaters, though chickadees and nuthatches frequent bird feeders for sunflower seeds, which they pound open with their bills as they can't chew as can sparrows and finches.