Bushtits are sprightly, social songbirds that twitter as they fly weakly between shrubs and thickets in western North America. Almost always found in lively flocks, they move constantly, often hanging upside down to pick at insects or spiders on the undersides of leaves. Flocks of Bushtits mix with similar small songbirds like warblers, chickadees, and kinglets while foraging. Bushtits weave a very unusual hanging nest, shaped like a soft pouch or sock, from moss, spider webs, and grasses.
Bushtits are social birds that live year-round in flocks of 10 to 40 birds. They range widely in winter, sometimes moving considerable distances to escape cold weather. When nesting, a pair usually tolerates other flock members near the nest.
Information from the All About Birds website, , © Cornell Lab of Ornithology.