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Gular skin - Wikipedia
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Emus - Potawatomi Zoo
This bird attracts his valentine with his heart-shaped red throat sac
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Behavior and Social Interaction in a Wet World, part III: Mating, Migration and Communication in Aquatic Avians - CR2
The Majestic Bird with Big Inflatable 'Breasts'
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10 Weird Self-Inflating Animal Species - Listverse
Bird Community Monitoring at Tallgrass Prairie National Preserve (U.S. National Park Service)
Emu Ostrich Stock Photo - Alamy
Bird « Creepy Animals
Bird Community Monitoring at Tallgrass Prairie National Preserve (U.S. National Park Service)
The Majestic Bird with Big Inflatable 'Breasts'
Inflatable Throat: Magnificent Frigatebird Mating Display | Bird Academy • The Cornell Lab
Ornithological Glossary -
Galapagos Great Frigate Bird - Animal Corner
Description of the Greater Prairie-Chicken
Gular skin - Wikipedia
