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Rocky Mountain locust
The Rocky Mountain locust (''Melanoplus spretus'') is an extinct species of locust that ranged through the western half of the United States and some western portions of Canada until the end of the 19th century. Sightings often placed their swarms in numbers far larger than any other locust species, with one famed sighting in 1875 estimated at in size (greater than the area of California), weighing 27.5 million tons, and consisting of some 12.5 trillion insects – the greatest concentration of animals ever speculatively guessed, according to ''Guinness World Records''.〔
Less than 30 years later, the species was apparently extinct. The last recorded sighting of a live specimen was in 1902 in southern Canada. Because a creature so ubiquitous was not expected to become extinct, very few samples were ever collected (though a few preserved remains have been found in Grasshopper Glacier, Montana). North America is the only continent without a major locust species, apart from Antarctica.
==Distribution==
The Rocky Mountain locust largely afflicted prairie areas, though they existed on both sides of the Rocky Mountains. Breeding in sandy areas and thriving in hot and dry conditions, they were often guaranteed a good food supply by prairie plants which concentrate sugars in their stalks in times of drought. Movement of the locusts was probably assisted by a low-level jet stream that persists through much of central North America.
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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