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For example, William McGrew, a professor of anthropology and zoology at Miami University in Oxford, Ohio, has studied handedness among chimps in the wild and determined that about half the animals are left-handed and half are right-handed."Each individual chimp seems to commit itself to one side or another," he said. "But chimps don't seem to show any overall leanings."William Hopkins, a psychologist at Berry College in Mount Berry, Georgia, disagrees. His studies with chimps in captivity show the animals overwhelmingly favor using their right hands.A common experiment he uses to test for handedness is giving a chimp a long tube with peanut butter lodged inside. If the chimp holds the tube with its left hand and probes for the peanut butter with its right hand, the animal is likely right-handed. Hopkins has found that the chimps almost always attack the peanut butter this way.