Assertion: human | /r/CapableOf | approach on foot
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Source sentences:
text: Coss' paper grew out of a 2015 study in which he and a former graduate student reported that zebras living near human settlements could not be approached as closely before fleeing as wild horses when they saw a human approaching on foot—staying just outside the effective range of poisoned arrows used by African hunters for at least 24,000 years.