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Giant anaconda
Reports of giant anacondas date back as far as the European colonization of South America, when sightings of anacondas upwards of 50 meters (164 feet) began to circulate amongst colonists, and the topic has been a subject of debate ever since among cryptozoologists and zoologists. Anacondas can grow to sizes of , and 97.5 kilograms (215 lbs.) in weight. In particular, the green or common anaconda is the heaviest and largest among all extant snakes in terms of robustness, and it is also the second-longest.〔Soomro, A. 2001. "Eunectes murinus" (On-line), Animal Diversity Web. Accessed January 10, 2008 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Eunectes_murinus.html〕 The longest reputably-measured and confirmed anacondas are about 5.21 metres (17.1 feet) long.〔 Lengths of 50–60 feet have been reported for this species, but such extremes lack verification. The only real reliable claims that can be found describe measured anacondas ranging from 26 to 39 feet, although these remain unverified.〔Murphy JC, Henderson RW. 1997. Tales of Giant Snakes: A Historical Natural History of Anacondas and Pythons. Krieger Pub. Cous. ISBN 0-89464-995-7.〕
==History==
The first recorded sightings of giant anacondas were from the time of the discovery of South America, when early European explorers entered the dense jungles and claimed to have seen giant snakes measuring up to long.〔(Extreme Science: Which is the Biggest Snake? ). Accessed January 10, 2008.〕 Natives also reported seeing anacondas upwards of 〔 to .〔 Anacondas above in length are rare. The Wildlife Conservation Society has, since the early 20th century, offered a large cash reward for live delivery of any snake of or more in length, but the prize has never been claimed, despite the numerous sightings of giant anacondas. In a survey of 780 wild anacondas in Venezuela, the largest captured was long.〔.(The Search for the $50,000 Snake ). (Archived ) 2009-10-31.〕 A specimen measured in 1944 exceeded this size when a petroleum expedition in Colombia claimed to have measured an anaconda which was in length, but its claim has never been proven.〔Krystek, Lee. (The Unmuseum: Big Snakes ). Accessed January 10, 2008.〕
Scientist Vincent Roth claimed to have shot and killed a specimen, but like most other claims, it lacks sound evidence. Another claim of a large anaconda was made by British adventurer Percy Fawcett. Following his 1906 survey of the Bolivia/Brazil border, Fawcett wrote that he had shot an anaconda that measured some from nose to tail.〔Justice, Aaron. (Cryptozoology: Sucuriju Gigante ) Accessed January 10, 2008.〕 Once published, Fawcett’s account was ridiculed. Decades later, Belgian cryptozoologist Bernard Heuvelmans came to Fawcett's defence, arguing that Fawcett's writing was generally honest and reliable.〔(Section Bernard Heuvelmans ). Accessed January 10, 2008.〕 Historian Mike Dash writes of claims of even larger anacondas, alleged to be as long as ,〔Dash, Mike ''Borderlands: The Ultimate Exploration of the Unknown''; Overlook Press, 2000, ISBN 0-87951-724-7.〕 with some of the sightings supported with photos (although the photos lack scale). Dash noted if reports of a anaconda strains credulity, then a long specimen would be an impossibility.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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