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A lake monster (or, in Scotland, loch monster) is a variety of freshwater-dwelling megafauna that has been claimed to exist by eyewitnesses, and which sometimes appears in mythology, rumor, or local folklore, but whose existence is not currently substantiated by clear physical evidence. Lake monsters are cryptids (animals whose existence has been proposed based on eyewitness testimony, but has yet to be confirmed). A very well-known example is the Loch Ness Monster. Lake monsters' depictions are often similar to some sea monsters. They are principally the subject of investigations by followers of the study of cryptozoology and folklore. ==Explanations== Many skeptics consider lake monsters to be purely exaggerations or misinterpretations of known and natural phenomena, or else fabrications and hoaxes. Most lake monsters have left no evidence of their existence besides alleged sightings and controversial photographs, and a large portion are therefore generally believed not to exist by conventional zoologists and allied scientists. Misidentified sightings of seals, otters, deer, diving water birds, large fish such as giant sturgeons or wels catfish, logs, mirages, seiches, light distortion, crossing boat wakes, or unusual wave patterns have all been proposed to explain specific reports. Social scientists add that descriptions of these creatures vary over time with the values and mood of the local cultures, following the pattern of folk beliefs and not what would be expected if the reports were of actual encounters with real animals. In Joe Nickell and Ben Radford's book ''Lake Monsters'', the authors attribute a vast number of sightings to otter misidentifications: as Ed Grabianowski said, As noted by the Swedish naturalist and author Bengt Sjögren (1980), the present-day lake monsters are variations of older legends of water kelpiess. Sjögren claims that the accounts of lake-monsters have changed during history. Older reports often talk about horse-like appearances, but more modern reports often have more reptile and dinosaur-like-appearances, and Sjögren concludes that the legendary kelpies evolved into the present day saurian lake-monsters since the discovery of dinosaurs and giant aquatic reptiles and the popularization of them in both scientific and fictional writings and art. Other widely varied theories have been presented by believers, including unknown species of giant freshwater eels or surviving aquatic, prehistoric reptiles, such as plesiosaurs. One theory holds that the monsters that are sighted are the occasional full-grown form of an amphibian species that generally stays juvenile all its life like the axolotl. Cryptozoologist Bernard Heuvelmans held throughout his life that plesiosaur-type sighting were actually an unknown species of long-necked seal, which also accounted for similarly-described sea serpents. In many of these areas, especially around Loch Ness, Lake Champlain and the Okanagan Valley, these lake monsters have become important tourist draws. 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「Lake monster」の詳細全文を読む スポンサード リンク
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