アカガオアメリカムシクイ Cardellina rubrifrons

Stunning warbler found in mountains and canyons with a mix of pine and oak. Gray overall with a striking red-and-black face. Rather long tail is actively flipped around, seemingly loosely attached to the body. Male and female are similar, but young birds show a duller orange-red face. Primarily a Mexican species, with breeding range barely extending into the southwest U.S. Winters as far south as Honduras.