When trying to identify the male Black-chinned Hummingbird there are several distinct identifying features to look for. The adult male has a more distinct black chin over purple gorget, looks black headed, has a short and slightly forked tail, their bill is long, slightly curved and light in color, and their tail tends to end at or very near their wing tips. One surprising fact about the male Black-chinned Hummingbird is that their average weight is 3.09 grams, which is less than the female weighs.
There are also very distinct identifying features for the adult female Black-chinned Hummingbird. Their bill is long, slightly curved and lighter in color than the male Black-chinned Hummingbird’s bill. The female Black-chinned Hummingbird has a grayer crown and a less contrasting head then its cousin the Ruby-throated Hummingbird. It is also grayer in overall color then its male counterpart. The female Black-chinned Hummingbird weighs an average of 3.42 grams, which is slightly more than the male.