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Saco fecal

Un carbonero de roble en San Luis Obispo, California, EE. UU. Extrayendo un saco fecal hecho por uno de los polluelos para mantener limpio el nido.

El saco fecal es una bolsa mucosa resistente y blanquecina que encierra en su interior las deyecciones de ciertos pollos nidícolas. Las aves adultas se llevan los sacos fecales y los abandonan a varios metros del nido o bien se los comen, lo que mantiene la higiene del nido evitando infecciones en la nidada y también evita que el olor de las heces en las cercanías revele la presencia del nido a los depredadores. Este comportamiento se da principalmente entre los passeriformes y los pícidos.

Bibliografía

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  • Glock, E. (1988). «Why do Parent Birds Swallow the Feces of their Nestlings?». Experientia (Birkhäuser.) 44 (6): 537-539. ISSN 0014-4754. 
  • Hard, Peter L., Patrick J. Weatherhead et Susan B. McRae (1991). «Parental consumption of nestling feces: good food or sound economics?». Behavioral ecology (International Society for Behavioral Ecology.) 2 (1): 69-76. ISSN 1465-7279. 
  • Herrick, Francis H. (1900). «Care of Nest and Young». The Auk (American Ornithologists' Union) 17 (2): 100-103. ISSN 1938-4254. 
  • Lang, Jason, D., Carrie A. Straight et Patricia Adair Gowaty (2002). «Observations of Fecal Sac Disposal by Eastern Bluebirds». Condor (Bulletin of the Cooper Ornithological Club) 104 (1): 205-207. ISSN 0010-5422. 
  • McGowan, Kevin J. (1995). «A Test of Whether Economy or Nutrition Determines Fecal Sac Ingestion in Nesting Corvids». Condor (Bulletin of the Cooper Ornithological Club) 97 (1): 50-56. ISSN 0010-5422. 
  • Morton, Martin L. (1979). «Fecal Sac Ingestion in the Mountain White-Crowned Sparrow». Condor (Bulletin of the Cooper Ornithological Club) 81 (1): 72-77. ISSN 0010-5422. 
  • Petit, Kenneth E., Lisa J. Petit, et Daniel R. Petit (1989). «Fecal Sac Removal: Do the Pattern and Distance of Dispersal Affect the Chance of Nest Predation?». Condor (Bulletin of the Cooper Ornithological Club) 91 (2): 479-482. ISSN 0010-5422. 
  • Petit, Daniel R. et Lisa J. Petit (1987). «Fecal Sac Dispersal by Prothonotary Warblers: Weatherhead's Hypothesis Re-Evaluated». Condor (Bulletin of the Cooper Ornithological Club) 89 (3): 610-613. ISSN 0010-5422. 
  • Terres, John K. (1980). The Audubon Society encyclopedia of North American birds. Knopf. New York. pp. 1109. ISBN 0394466519. OCLC 6091994. 
  • Weatherhead, Patrick J. (1988). «Adaptive Disposal of Fecal Sacs?». En Bulletin of the Cooper Ornithological Club, ed. Condor 90 (2): 518-519. ISSN 0010-5422. 
  • Weatherhead, Patrick J. (1984). «Fecal Sac Removal by Tree Swallows: The Cost of Cleanliness». Condor (Bulletin of the Cooper Ornithological Club) 86 (2): 187-191. ISSN 0010-5422. 
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Saco fecal
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