Any member of the horse family, including horses, donkeys, zebras, and their relatives.
From Latin 'equus' (horse) + '-id' (denoting a member of a family). This zoological classification term comes directly from the scientific family name Equidae.
All equids—horses, zebras, donkeys, and wild asses—share a common ancestor from about 55 million years ago, and they're all recognizable by their single-hoofed feet, making them unique among large mammals.
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