What shape distinguishes the adult male Costa's Hummingbird gorget display?
Answer
Fan-shaped or spikey "whiskers" extending sideways
The defining characteristic of the adult male Costa's Hummingbird gorget, beyond its deep purple or magenta iridescence, is its unique shape during display flights. The feathers spread out significantly sideways, forming what is frequently described as flared "whiskers" or a fan-shaped structure. This flared arrangement extends noticeably beyond the sides of the bird's head, serving as the most critical visual cue to separate it from the Black-chinned male, which lacks these dramatic lateral extensions.
Related Questions
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