The Blue-throated Hummingbird (Lampornis clemenciae) is the largest normally occurring hummingbird in the U.S.  It measures about the same as a Magnificent Hummingbird, but is a good bit heavier.  It is normally found in southeastern Arizona and southwestern Texas in mountain canyons and along streams.

Description:

Male: Green back, forehead, and crown, throat is iridescent blue, broad white eye stripe with a less distinct white malar stripe, dark ear patch, tail has large white tips on outer tail feathers, bill is black, breast and flanks are gray.  When male is on territory it give an incessant "seep" call.

Female: Green back, forehead, and crown, throat is gray, broad white eye stripe with a less distinct white malar stripe, dark ear patch, tail has large white tips on outer tail feathers, bill is black, breast and flanks are gray.

Distribution:

Observed in Arizona, New Mexico, and Texas.