Word: humboldt
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Dates: during 1930-1939
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...mouse population exceeds the normal. Naturalists have noticed that the increase generally comes every eleven years, coincides with the sunspot cycle. They have suggested that the mildness of minimum sunspot winters is an important cause. Two famed mouse plagues have occurred in the U. S. One was in Humboldt Valley, Nev., in 1906-07. At the height of the plague there were from 8,000 to 12,000 mice per acre on large ranches. In 1926 an army of house mice marched out of the Buena Vista lake basin maize fields. Meadow mice joined them. Hundreds of thousands swarmed over...