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"You could send him on chores. He would take the wheelbarrow and empty the hay and straw from the stalls. And when it was time to feed the dogs, he would get the pans, and mix the dog food for me. I'd get it ready and he'd mix it,'' she said. As he grew older, Oliver also acquired habits normally enjoyed only by humans, including a cup of coffee and a nightcap. "This guy, Oliver, he enjoyed sitting down at night and having a drink, and watching television. He'd mix his own. He'd pour a shot of whiskey and put some Seven-Up in there, stir it and drink it,'' she recalled.
Oliver also displayed emotions not normally associated with chimpanzees, including tears of remorse at temporary separations. But ultimately, it was another of Oliver's human like traits that forced the Burgers to sell him. By 1976, when he was approaching sexual maturity, Oliver was turning into a masher.