Female Black-chinned Hummingbird. The Black-chinned Hummingbird (Archilochus alexandri) is a small hummingbird. Adults are metallic green above and white below with green flanks. Their bill is long, straight and very slender. The adult male has a black face and chin, a glossy purple throat band and a dark forked tail. The female has a dark rounded tail with white tips and no throat patch; they are similar to female Ruby-throated Hummingbirds.