The black-chinned hummingbird (Archilochus alexandri) and the broad-tailed hummingbird (Selasphorus platycercus) are two small, migratory hummingbirds that are found in North America. Both species are very similar in appearance, but there are a few key differences that can help you to identify them.
The black-chinned hummingbird has a black chin and a white throat, while the broad-tailed hummingbird has a green chin and a buffy throat. The black-chinned hummingbird also has a shorter, straighter bill than the broad-tailed hummingbird. Both species have iridescent green backs and wings, and they both have white tips on their tails.