Average weight: male 3.05 g, female 3.22 g. Female birds are larger
Adult male: Metallic green back, violet-purple crown and gorget
with very long side throat feathers, green breast.
Adult female: Green back and crown, white breast, white throat with
some black spots, buff sides, white tips on outer tail feathers.
Observed in Alaska, Arizona, California, Kansas, Nevada, New Mexico,
Oregon, Texas, Utah, and British Columbia. Winters in SE California,
SW Arizona, NW Sonora, and Baja. Costa's don't migrate very long
distances, and can be among the first migrant birds to arrive in
For maps showing population distribution and trends, see the National
Biological Service's North American Breeding Bird Survey species