Male frigatebirds attract mates with an elastic, red gular pouch that is inflatable.

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"A male frigatebird or Man-o-war bird has selected a suitable nest site and is advertising for a mate by inflating its crimson throat pouch. As soon as the first egg is laid, the pouch will be deflated." (Foy and Oxford Scientific Films 1982:76)

The grand design: Form and colour in animalsNovember 25, 1983
Sally Foy

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Magnificent Frigate BirdFregata aquilaSpecies

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