During the coldest years of the last ice age—and especially in harsh Arctic and sub-Arctic winters—reindeer, wild horses and other human prey animals would have been eking out an existence, nearly devoid of fat and composed mostly of lean muscle. Using previously published early fossil records, Lahtinen and her colleagues calculated that the game captured by people in the Arctic and sub-Arctic during this time would have provided much more protein than they could have safely consumed.
In more ecologically favorable conditions, wolves and humans would have been competing for the same prey animals. But under the harsh circumstances of the Arctic and sub-Arctic ice age winter, sharing excess meat with canines would have cost people nothing. The descendants of wolves that took advantage of such handouts would have become more docile toward their bipedal benefactors over time, and they likely went on to become the first domesticated dogs. As the authors point out, the theory makes sense not just ecologically but also geographically: the earliest Paleolithic dog discoveries primarily come from areas that were very cold at the time.
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