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Cannibalism (zoology)
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Cannibalism (zoology) : ウィキペディア英語版
Cannibalism (zoology)

In zoology, cannibalism is the act of one individual of a species consuming all or part of another individual of the same species as food. To consume the same species or show cannibalism is a common ecological interaction in the animal kingdom and has been recorded for more than 1,500 species.〔G. A. Polis, The evolution and dynamics of intraspecific predation. Annual Review of Ecology and Systematics 12, 225-251 (1981).〕
It does not, as once believed, occur only as a result of extreme food shortages or artificial conditions, but commonly occurs under natural conditions in a variety of species.〔〔Laurel R. Fox, Cannibalism in natural populations. Annual Review of Ecology and Systematics 6, 87-106 (1975).〕〔M. A. Elgar and B. J. (eds) Crespi, Cannibalism: Ecology and evolution among diverse taxa. (Oxford University Press, New York, 1992).〕 Cannibalism seems to be especially prevalent in aquatic communities, in which up to approximately 90% of the organisms engage in cannibalism at some point of the life cycle. Cannibalism is also not restricted to carnivorous species, but is commonly found in herbivores and detritivores.〔
== Sexual cannibalism ==
(詳細はconspecific male before, during, or after copulation. Rarely, these roles are reversed. Sexual cannibalism has been recorded in the female redback spider, black widow spider, praying mantis, and scorpion, among others.

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