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Caruncle (bird anatomy)

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Caruncle (bird anatomy)

Anatomical structures on the head and throat of a domestic turkey. 1. Caruncles, 2. Snood, 3. Wattle (Dewlap), 4. Major caruncle, 5. Beard

A caruncle is defined as 'a small, fleshy excrescence that is a normal part of an animal's anatomy'.[1] Within this definition, caruncles in birds include wattles (or dewlaps), snoods and earlobes. The term caruncle is derived from Latin 'caruncula', the diminutive of 'carō', flesh.[2]

Taxonomy

Caruncles are carnosities, often of bright colors such as red, blue, yellow or white. They can be present on the head, neck, throat, cheeks or around the eyes of some birds. They may be present as combs or crests and other structures near the beak, or, hanging from the throat or neck. Caruncles may be featherless, or, have small scattered feathers. In some species, they may form pendulous structures of erectile tissue, such as the "snood" of the domestic turkey.[3][4][5]

Male Andean Condors have a wattle on the neck and a dark red comb on top of the head.

Caruncles are sometimes secondary sexual characteristics, having a more intense color or even a different color, developing as the male reaches sexual maturity.

Function

Caruncles are also ornamental elements used by males to attract females to breeding.[6] Having large caruncles or colorful bright ones indicates high levels of testosterone, that they are well-fed birds able to elude other predators thus showing the good quality of their genes.[7] It has been proposed that these organs are also associated with genes which encode resistance to disease.[7] It is believed that for birds living in tropical regions, the caruncles also play a role in thermoregulation, making the blood cool faster when flowing through them.[8]

Turkeys

In [9]

The beard (a tuft of modified brush-like feathers) also becomes erect.

Muscovy ducks

In the context of Muscovy ducks, caruncles refer to the red fleshy mask that surrounds the head of adult birds, particularly prominent in adult drakes (males).[10]

Birds with caruncles

Many species from a variety of families present caruncles, among them are:

Gallery

Birds which present caruncles
Roosters often have large crests. 
The Mountain caracara, like many hawks, has carunculated features. 
The Saddlebacks from New Zealand have wattles hanging from the sides of their beak. 
The King vulture has multi-colored wattles. 
The head and neck of the Cassowary are covered with blue and two red wattles hanging from them. 
The face of the Muscovy duck is covered with red wattles. 

References

  1. ^ Lexic.us. "Definition of caruncle". Retrieved April 20, 2013. 
  2. ^ Merriam-Webster. "Caruncle". Retrieved April 20, 2013. 
  3. ^ Sharpe, Richard Bowdler (1888). Catalogue of the birds in the British Museum. British Natural History Museum Department of Zoology. 
  4. ^ "Caruncle definition". Word Reference Dictionary. Retrieved 2014-05-16. 
  5. ^ Audubon, John James; Amadon, Dean; Bull, John L. (1967). The Birds Of America. Dover Publications.  OCLC 555150
  6. ^ Burke, Don (2005). The Complete Burke's Backyard: The Ultimate Book of Fact Sheets. p. 702.  
  7. ^ a b Are large wattles related to particular MHC genotypes in the male pheasant?. Springer, Part of Springer Science+Business Media. 
  8. ^ Buchholz, Richard (1996). Thermoregulatory Role of te Unfeathered Head and Neck in Male Wild Turkeys. Sora.unm.edu. p. 311. 
  9. ^ Graves, R.A. (2005). "Know your turkey parts". Retrieved April 20, 2013. 
  10. ^ Heritage Poultry Breeders Association of America (2013). "Muscovy Ducks". Retrieved April 20, 2013. 

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