The following information was found at: http://www.derived.com/hummers/frames/welcome.html

Anna's Hummingbird (Calypte anna)
Anna's is the most common hummingbird in southern California, and one of only two species that are permanent residents of the US or Canada (Allen's is the other). Unlike most other hummers, Anna's has a (minimal) song.

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.

Distribution
Observed in Alabama, Alaska, Arizona, Arkansas, California, Colorado, Florida, Georgia, Idaho, Louisiana, Mississippi, Missouri, Montana, Nevada, New Mexico, Oregon, Tennessee, Texas, Utah, Washington, and British Columbia (resident on Vancouver Island).

For maps showing population distribution and trends, see the National Biological Service's North American Breeding Bird Survey species account.