A Kind of Grasshopper That Migrates in Swarms

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Question is: A Kind of Grasshopper That Migrates in Swarms

and the answer is: LOCUST

Word Meaning:

LOCUST — Any of the grasshoppers, often polyphenic and usually swarming, in the family Acrididae that are very destructive to crops and other vegetation, especially migratory locusts (Locusta migratoria).

Definitions from Wiktionary.

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