One of the mysteries of the English language finally explained.
A bird of prey that catches mice; especially †(a) the short-eared owl, Asio flammeus (obsolete); (b) US the hen harrier, Circus cyaneus; (c) US the rough-legged buzzard, Buteo lagopus (rare).
Old English; earliest use found in Corpus Glossary. From mouse + hawk.
mouse hawk/ˈmaʊs hɔːk/
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