Adult males are so wildly colorful that the only real problem is singling out a field mark.
The dark forked tail separated from the dark belly by white undertail coverts creates a pattern that is another excellent point of separation from most other U.S. hummers. Adult male Broad-billed Hummingbird. Females are another matter altogether. In practice, though, female broad-billeds are actually fairly easily identified by the combination of grayish ear patches, often set off from the green of the crown by a white eyeline. Female broad-billed hummer.