Scientists don't know for sure whether humans domesticated wolves or if wolves did it themselves. Catherine says this theory makes sense because there's an obvious benefit to the wolves here. If they found our waste as a source of food, they'd keep eating it. She wants to figure out what makes wolves and dogs different today.
Dogs were the first domesticated animal in history, emerging from wolves some 20,000 years ago. But how did wolves become dogs? To find the answer, scientists have to play with a lot of puppies.
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