Male frigatebird has iridescent green back feathers and displaying for females. The gular sac is used as part of a courtship display and is, perhaps, the most striking frigatebird feature.

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great frigatebird Marine National Monument Outdoor vibrant in color great green island wild animal no people fregata minor palmerstoni Midway national wldlife refuge nobody red atoll hawaii Conservation Area Adult display breeding colors tree color image profile iridescent papahanaumokuakea mature nature side view horizontal animal bird one animal male United States seabird wildlife courting National Park ©Jeanine Lovett fregata minor wild frigatebird