Look for Anna's hummingbird along the Pacific Ocean in California, Oregon and Washington west of the Cascade and Sierra Nevada Mountains. They are also seen in southern California and southwestern Arizona. Anna's hummingbirds prefer low altitude fields, gardens and woodlands.
Anna's hummingbirds are very territorial about their feeding grounds. They will defend their territory from other hummingbirds, other bird species, large insects and even mammals much bigger than themselves!