This is female or immature male Broad-tailed Hummingbird.
Broad-tailed Hummingbirds are birds of high elevations, and this photo was taken high on the slopes of Volcan de Nieve, one of the volcanoes shared by the states of Colima and Jalisco, Mexico.
While studying this picture, I surmised that this hummingbird's tail is injured, because the white-tipped outer tail feathers are visible centrally (the central tail feathers, which fold on top of the outer feathers, are not white-tipped) and that perhaps the wispy feathers above the tail could be the remnants of the original central tail feathers.
After pondering this, and studying various field guides, I looked at other pictures I had taken later of the same bird, and discovered my answer!
Here is the bird from a different angle.
I took those pictures driving up the mountain. Four hours later, on the way down, I stopped at the same spot, and took the picture below, which solves the mystery! Sure enough, the central tail feathers (rectrices) are missing.