Tasha is referring to one of those collective nouns that no one actually uses but that are sometimes rather picturesque. For squirrels, "dray" and "scurry" are given on various online lists:
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"Ask FunTrivia" strives to offer the best answers possible to trivia questions. We ask our submitters to thoroughly research questions and provide sources where possible. Feel free to post corrections or additions. This is server B184.