I thought this was really interesting. Scientists were trying to domesticate foxes and this happened:
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After a few generations, the results began to get a little weird. The study found that though they were selectively breeding only for behavior, they began seeing new common physical traits. The animals developed different coat patterns, floppier ears, tails that curled over their backs--totally unknown in wild foxes. When we tried to breed a fox that would act more like a dog, we ended up with a fox that looked more like a dog.
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