DrLudicrous writes "ABC is running a story about anthropologist Christy Turner's theory about hyenas, humans and dogs. The idea is that humans were unable to encroach on Alaska, and thus the Americas, thousands of years ago because of gigantic, bone-crushing hyenas, much larger than their African cousins. Eventually, the domestication of dogs somehow provided the first Americans with protection against these beasts, and within a couple of millenia, the ancient hyenas were extinct."
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