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The tire was preventing the dominant bull rhino from eating and drinking, the veterinarians said.
"The muscles that open your mouth are much weaker than the muscles which close your mouth, since they usually have the help of gravity, so no amount of straining was going to enlarge the tire's central hole," the group said.
The veterinarians tranquilized Mark and were able to pull the tire away from his face without cutting it.
"Eleven minutes later he was antidoted and grazing again as if nothing had happened," AWARE said.