Physical Description Average weight: male 4.31 g, female 4.07 g. The Anna's is the largest hummingbird seen on the west coast. Plumage Adult male: Metallic green back, dark rose-red crown and gorget, grayish breast. Adult female: Green back, grayish-white breast, white throat with some red spots, white tips on outer tail feathers. Juveniles: Young of both sexes look like the adult female, but may have unmarked throats.
Unlike other birds, a hummingbird can rotate its wings in a circle. It can also hover in one spot; fly up, down, sideways, and even upside down (for short distances); and it is the only bird that can fly backward.