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Ear tuft
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==Birds== Bird ear tufts are skin projections covered in feathers found in some bird species, most notably various species of [[owl]], vaguely resembling mammalian ears, but unrelated to the animal's hearing. Theories about their function range from improved ability to camouflage,<ref name="Perrone">{{cite journal | author = Perone, M.| year = 1981 | title = Adaptive significance of ear tufts in owls | doi = 10.2307/1367512| journal = Condor | volume = 83 | issue = 4 | pages = 383β384 | jstor = 1367512 }}</ref> aiding in finding a suitable mate,<ref>{{cite book|last=Sparks|first=J.|title=Owls: their natural and unnatural history |url=https://archive.org/details/owlstheirnatural0000spar|url-access=registration|year=1970|publisher=Taplinger|location=New York|author2=Soper, T. |isbn=978-0-8008-6170-4 }}</ref><ref>{{cite book|last=Burton|first=J.A.|title=Owls of the world: their evolution, structure and ecology|year=1973|publisher=Dutton|location=New York}}</ref> to giving a more threatening appearance to discourage predators.<ref name=Mysterud>{{cite journal |author1=Mysterud, I. |author2=Dunker, H. |title=Mammal ear mimicry: a hypothesis on the behavioural function of owl "horns" |journal=Animal Behaviour |volume=27 |pages=315 |date=1979 |doi=10.1016/0003-3472(79)90158-1}}</ref> ===In Araucana chicken=== In the [[Araucana]] breed of chickens, ear tufts are a [[mutation]]. It causes a skin projection covered in feathers to appear on the sides of the head near the ears. This mutation is [[inherited disorder|dominant semi-lethal]]. Consequently, ear tufts are very unusual and difficult to breed, as most Araucanas are hatched without tufts.<ref name="Ear tuft">{{cite web|title=Araucanas by Alan Stanford, Ph.D from the June/July, 2007 issue of Backyard Poulty|url=http://www.backyardpoultrymag.com/issues/2/2-3/Alan_Stanford.html|publisher=Backyard Poultry|access-date=12 February 2013}}</ref> ===Lethal gene=== Ear tufts in the Araucana breed of chicken are associated with a lethal [[gene]]: An ear tufted hen mated with an ear tufted cock produce chicks with deformed ears and mouth that die before hatching. Also, the rumplessness of the breed makes breeding Araucanas together have very short backs. In any other chicken breed, ear tufts are undesirable. <ref>''The Chicken Encyclopedia'' by [[Gail Damerow]], pg. 59</ref>
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