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''Eunectes murinus'' (derived from the Greek meaning "good swimmer" and the Latin ''ラテン語:murinus'' meaning "of mice" for being thought to prey on mice), commonly known as the green anaconda, is a non-venomous boa species found in South America. It is the largest, heaviest, and one of the longest known extant snake species. The term ''anaconda'' (without further qualification) often refers to this species, though the term could also apply to other members of the genus ''Eunectes''. Other common names include common anaconda and water boa. ==Description== The green anaconda is the world's heaviest and one of the world's longest snakes, reaching long.〔 More typical mature specimens reportedly can range up , with the females, at around a mean length of , being generally much larger in adulthood than the male, which averages around .〔O'Shea, M. 2007. ''Boas and pythons of the world''. Princeton, N.J.: Princeton University Press.〕〔 Minton, Sherman A., and Madge Rutherford Minton. Giant Reptiles. New York: Scribners, 1973.〕〔Rivas, J., G. Burghardt. 2001. ''Understanding Sexual Size Dimorphism in Snakes: wearing the snake's shoes''. Animal Behaviour, 62: F1-F6.〕 Weights are less well studied, though will reportedly range from in an average-range adult.〔 Pope, Clifford Millhouse. ''The Giant Snakes: The Natural History of the Boa Constrictor, the Anaconda, and the Largest Pythons, Including Comparative Facts about Other Snakes and Basic Information on Reptiles in General''. New York: Knopf, 1961.〕〔Duellman, W. 2005. ''Cusco Amazonico: The Lives of Amphibians and Reptiles in an Amazonian Rainforest''. Ithaca, New York: Comstock Books in Herpetology.〕 It is the largest snake native to the Americas. Although it is slightly shorter than the Reticulated python, it is far more robust: the bulk of a 4.5m green anaconda would be comparable to a 7.4m reticulated python.〔Mark O'Shea, Boas and Pythons of the World, page 55〕 ''Eunectes murinus'' is probably the heaviest extant species of snake or squamate in the world, perhaps only rivaled by the Komodo dragon. Reports of anacondas 35–40 feet or even longer also exist, but such claims need to be regarded with caution, as no specimens of such lengths have ever been deposited in a museum and hard evidence is lacking.〔Murphy JC, Henderson RW. 1997. ''Tales of Giant Snakes: A Historical Natural History of Anacondas and Pythons''. Krieger Pub. Co. 221 pp. ISBN 0-89464-995-7.〕 A $50,000 cash reward is offered for anyone who can catch an anaconda or longer, but the prize has not been claimed yet. The longest (and heaviest) verified specimen encountered by Dr. Jesús Antonio Rivas, who had examined thousands of anacondas, was a female measuring long and weighing . The color pattern consists of olive green background overlaid with black blotches along the length of the body. The head is narrow compared to the body, usually with distinctive orange-yellow striping on either side. The eyes are set high on the head, allowing the snake to see out of the water while swimming without exposing its body. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Green anaconda」の詳細全文を読む スポンサード リンク
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