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As with many species of birds, male hummingbirds are typically more brightly colored than females. In North America, the most common species of hummingbird are the Ruby-Throated and the Rufous. Both species are sexually dimorphic (meaning you can tell the difference between a male and a female by looking at them). Male Ruby-Throated hummers have a bright red gorget (or bib) that the females lack. Likewise, male Rufous hummers have a bright orange gorget, while females do not. When hummingbirds are young and sexually immature, males and females can appear identical. Also, there are a couple of species, such as the Berylline and Buff-bellied hummingbirds, where the color variation between an adult male and female are difficult to distinguish.
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