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" ... Three species of zebras have been described based on body size and stripe morphology, as well as several other distinguishing traits. One of those species, the plains zebra, Equus quagga (formerly Equus burchellii) is easily recognized just by its stripes, which are broader than those of the other two zebra species, although even amongst plains zebras, there is a consistent, clearly visible gradient of differences in stripe patterns between northern and southern plains zebra populations. ... "