A hummingbird's brilliant throat feathers are called a "gorget," a term applied in past centuries to the metallic swatch protecting the throat of a knight-in-armor. Light waves reflect and refract off the throat feathers, creating color in the manner of sun glinting off a film of oil on water. The gorget of this Rufous Hummingbird is stunning!

More info and transcript at BirdNote.org. 

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