Crop (anatomy)

Source: Wikipedia, the free encyclopedia.
This article is about the digestive croup. For the top of the hindquarters, also known as the croup, see Rump (animal).
Two white-bellied parrots with bulging crops after feeding.
A
graylag goose
eats grass, the full crop is clearly visible.
One greater flamingo-chick in Zoo Basel is fed on crop milk.
Columba livia
) is prominently seen at the beginning of the alimentary canal.

The crop (also the croup, the craw, the ingluvies, and the sublingual pouch) is a thin-walled, expanded portion of the

gastropods (snails and slugs), earthworms,[1] leeches,[2] and insects.[3]

Insects

Cropping is used by

bees to temporarily store nectar of flowers. When bees "suck" nectar, it is stored in their crops.[4]
Other
ants, has specialized to be distensible, and this specialization enables important communication between colonial insects through trophallaxis.[5]
The crop can be found in the foregut of insects.[6]

Birds

In a

gullet or throat. It is a part of the digestive tract, essentially an enlarged part of the esophagus. As with most other organisms that have a crop, it is used to temporarily store food. Not all bird species have one. In adult doves and pigeons, it can produce crop milk to feed newly hatched birds.[7]

Scavenging birds, such as vultures, will gorge themselves when prey is abundant, causing their crop to bulge. They subsequently sit, sleepy or half torpid, to digest their food.

Most

turkeys, ducks[8] and geese[9] possess a crop, as do parrots.[10] Pigeons also have crops; one domestic breed type is even bred to exaggerate the typical crop-inflating behavior so that the crop is inflated like a balloon
.

Some extinct birds like Enantiornithes did not have crops.[11]

Literary references

In the Sherlock Holmes story "The Adventure of the Blue Carbuncle" (1892), a valuable gem is hidden inside a bird's crop.[12]

"Craw" is an obsolete term for "crop",[13] and this is still seen in the saying "it sticks in my craw" meaning "I can't [metaphorically] swallow it", that is, that a situation or other entity is unacceptable, or at any rate annoying.[14]

See also

References

  1. ^ "Worm World: About Earthworms". Archived from the original on 2008-12-04. Retrieved 2008-12-16.
  2. ^ Sawyer, Roy T. "Leech Biology and Behaviour, Volume II" (PDF). Retrieved 2014-01-09.
  3. ISBN 9780030968358
    .
  4. ^ "Honeybee Biology". 1994. Retrieved 2008-12-16.
  5. PMID 27894417
    .
  6. ^ Sal, Lorrianne K. (12 February 2017). "Digestion: An imperative process for insects".
  7. ^ Gordon John Larkman Ramel (2008-09-29). "The Alimentary Canal in Birds". Retrieved 2008-12-16.
  8. S2CID 246040130
    .
  9. ^ "Chapter 3. DIGESTIVE PHYSIOLOGY".
  10. ^ Grindol, Diane (12 December 2013). "Five Pet Parrot Facts". Lafeber Company. Retrieved 6 November 2021.
  11. S2CID 210265348
    .
  12. ^ Alfred Hickling. "Review: The New Annotated Sherlock Holmes edited by Leslie S Klinger | Books". The Guardian. Retrieved 2012-07-26.
  13. ^ "craw". Merriam-Webster Dictionary. Retrieved July 6, 2023.
  14. ^ "stick in your craw". Macmillan Dictionary. Retrieved August 15, 2021.

External links

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