Inflated throat sacs, spread tail, and wings raised tightly against the body are all parts of greater sage-grouse lek displays Stock Photo - Alamy
American Museum of Natural History on Twitter: "What's the purpose of the sacs of the lesser sac-winged bat? The sacs on its wings are scent glands, which are used to mark territory
File:Cranial sinus and postcranial air sac systems in birds.svg - Wikimedia Commons
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The Respiratory System of a Bird. Air sacs and Lungs Stock Photo - Alamy
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