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Researchers Debate Divergence of Wolves, Dogs

There are about 1 billion dogs in the world, hundreds of breeds, uncountable mixes. But all these animals share a common ancestor, the wolf. Scientists continue to debate when and where dogs and wolves diverged. Some studies date that split to between 10,000 and 15,000 years ago. But zoologist Love Dalen at the Swedish Natural History Museum said it could be twice that long ago. He based that estimate on a Taimyr wolf bone fragment he discovered on an expedition to Siberia. Carbon...

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