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[[File:Centrocercus minimus.jpg|250px|thumb|right|Male [[sage grouse]] have two gular sacs that they inflate to |
[[File:Centrocercus minimus.jpg|250px|thumb|right|Male [[sage grouse]] have two gular sacs that they inflate to attract mates.]] |
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'''Gular skin''' (throat skin), in [[ornithology]], is an area of [[feather]]less skin on birds that joins the lower [[mandible]] of the [[beak]] (or ''bill'') to the bird's [[neck]].<ref name="gloss">{{Cite web|url=http://www.virtualmuseum.ca/Exhibitions/Birds/MMMN/English/glossary_data.html|title=Glossary of Ornithology Terms|accessdate=July 29, 2008|publisher=[[Manitoba Museum of Man and Nature]]|year=2008|author=Manitoba Museum of Man and Nature}}</ref> Other vertebrate taxa may have a comparable anatomical structure that is referred to as either a gular sac, throat sac, [[vocal sac]] or [[gular fold]]. |
'''Gular skin''' (throat skin), in [[ornithology]], is an area of [[feather]]less skin on birds that joins the lower [[mandible]] of the [[beak]] (or ''bill'') to the bird's [[neck]].<ref name="gloss">{{Cite web|url=http://www.virtualmuseum.ca/Exhibitions/Birds/MMMN/English/glossary_data.html|title=Glossary of Ornithology Terms|accessdate=July 29, 2008|publisher=[[Manitoba Museum of Man and Nature]]|year=2008|author=Manitoba Museum of Man and Nature}}</ref> Other vertebrate taxa may have a comparable anatomical structure that is referred to as either a gular sac, throat sac, [[vocal sac]] or [[gular fold]]. |
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Gular skin (throat skin), in ornithology, is an area of featherless skin on birds that joins the lower mandible of the beak (orbill) to the bird's neck.[1] Other vertebrate taxa may have a comparable anatomical structure that is referred to as either a gular sac, throat sac, vocal sacorgular fold.
Gular skin can be very prominent, for example in members of the order Phalacrocoraciformes as well as in pelicans (which likely share a common ancestor). In many species, the gular skin forms a flap, or gular pouch, which is generally used to store fish and other prey while hunting.
Incormorants, the gular skin is often colored, contrasting with the otherwise plain black or black-and-white appearance of the bird. This presumably serves some function in social signalling, since the colors become more pronounced in breeding adults.
Infrigatebirds, the gular skin (orgular sacorthroat sac) is used dramatically. During courtship display, the male forces air into the sac, causing it to inflate over a period of 20 minutes into a startling huge red balloon.
Because cormorants are closer relatives of gannets and anhingas (which have no prominent gular pouch) than of frigatebirds or pelicans, it can be seen that the gular pouch is either plesiomorphic or was acquired by parallel evolution.
The orangutan is the only known great ape to have this characteristic, where it is only present in males. In addition some species of gibbon ape and the walrus have a throat sac. Many amphibians will inflate their vocal sac to create certain vocalizations in order to communicate, scare off rivals (to proclaim territory or dominance), and to locate and attract a mate. The gular sac in this instance amplifies their voice to be heard louder and seemingly closer. Some species of lizard also have a gular fold and consequently, gular scales.
The conus snail has a throat sac.
The snow goblininDungeons & Dragons and the great oopikinStar Wars are two fictional species that have a throat sac.
