Ole Jorgen Liodden / Magnificent frigatebird (Fregata magnificens) male with gular pouch, Galapagos.
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Ole Jorgen Liodden / Brown pelican (Pelecanus occidentalis urinator) close up of throat pouch skin, with beak open, Galapagos.
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John Cancalosi / Colorado river toad (Incilius alvarius) male calling to attract females, vocal sac filled with air. Sonoran desert, Arizona, USA. August.
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John Chan / California brown pelicans (Pelecanus occidentalis californicus) stretching their gular pouches and preening, resting near to a flock of Elegant terns (Thalasseus elegans), Southern California, USA, Ma...
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Lynn M. Stone / Magnificent frigate bird (Fregata magnificens) perched in Red mangrove (Rhizophora mangle) tree. Tampa Bay islet roosts, Tierra Verde, Pinellas County, Florida, USA.
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Lynn M. Stone / Magnificent frigate bird (Fregata magnificens) in flight with red pouch inflated Tampa Bay, Tierra Verde, Pinellas County, Florida, USA.
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Lynn M. Stone / Magnificent frigate bird (Fregata magnificens) perched in Red mangrove (Rhizophora mangle) tree. Tampa Bay islet roosts, Tierra Verde, Pinellas County, Florida, USA.
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Sylvain Cordier / Humpback whale (Megaptera novaeangliae) feeding at the surface, showing expandable throat grooves, Svalbard, Norway.
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Tui De Roy / Waved albatross (Phoebastria irrorata) fishhook embedded in nesting albatross' throat. Punta Suarez, Espanola Island, Galapagos.
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Tui De Roy / Waved albatross (Phoebastria irrorata) with fishhook embedded in throat, Punta Suarez, Espanola Island, Galapagos.