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The throat sac of male frigate birds can be inflated with air and is used to impress the females, both visually and by helping to resonate the loud rattlings and yodels of courting males.  Galapagos, Equador.
The throat sac of male frigate birds can be inflated with air and is used to impress the females, both visually and by helping to resonate the loud rattlings and yodels of courting males. Galapagos, Equador.
Filename: Galagpagos_0005.jpg
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Keywords:
Galapagos
Plumage
Ocean
Female
Bird
Frigate
Water
Fish
Equador