Very small, fork-tailed hummingbird endemic to western Mexico. Favors scrubby woodland, forest edge, and flower banks; mainly in drier habitats. Feeds at all levels, wagging its tail as it feeds. Males sometimes perch on exposed high twigs. Male is distinctive; wholly emerald green (crown is not really golden, more of a golden-green) with very long, deeply forked blackish tail, and reddish bill with a black tip. Female has a striped face and reddish bill with a black tip. Female resembles female Broad-billed Hummingbird, but much smaller with a shorter and straighter bill.