Rocky Mountain Locust

The Rocky Mountain locust (Melanoplus spretus) was the locust species 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 species of locust, with one famed sighting estimated at 198,000 square miles 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.

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