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Because of relatively poor eyesight, wildebeests (gnus) often commingle with zebras to take advantage of the zebras' visual acuity, while the zebras benefit from the larger herd as protection from predators. Last November, there was a story from a Ngorongoro Crater park ranger of a male zebra driving away a hyena that was chasing a wildebeest calf, while the wildebeest looked or ran the other way. Fact: zebras are black with white stripes, confirmed through embryonic analysis.