This is a female Rufous Hummingbird (Selasphorus rufus),
one of many various species of hummingbirds living in the Spring Mountains of Nevada in summertime.

I took this photo on top of Big Falls. I was on my way to Charleston Peak via a very seldom done Southeast Ridge route.
July 2007.

The Rufous Hummingbirds are the most widely-distributed hummingbirds in North America. They winter in Mexico and possibly Panama. Their average weight is: male 3.22 g, female 3.41 g. Females are larger than males.