Crows walk at low speeds but hop to go faster, setting their feet down out of phase with each other. In contrast, various other bipeds that hop set their feet down in phase with each other. Films of four species of crows have been analysed to obtain quantitative descriptions of their gaits. Comparisons are made with kangaroos, hopping rodents and a small passerine bird.
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Hayes et al. (1983) studied this question.
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