Jane Goodall discovered that chimps hunt and eat smaller primates such as "Colobus" monkeys. Goodall watched a hunting group isolate a colobus high in a tree, block all possible exits, then one chimpanzee climbed up and captured and killed the colobus. The others then each took parts of the carcass, sharing with other members of the troop in response to begging behaviours. The chimps at Gombe kill and eat as much as "one-third of the colobus population" in the park each year. This alone was a major scientific find which challenged previous conceptions of chimp diet and behavior.