美国科学60秒 SSS 2013-01-31

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　　That evolutionary³ adaptation may help fuel domestication⁴. The report is in the journal nature.

　　Dogs and wolves hail from a common canine⁵ ancestor and though you can still see the strong resemblance, many traits distinguished⁶ two today.

　　Wolves have large teeth and skulls⁷ than dogs do.

　　And they are far less like to bring your newspaper and slippers⁸. To figure out how such difference might have evolved. Researchers compare the DNA⁹ of dozen wolves and 14 different dog breeds from Cocker Spaniels and German Shepherds.

　　And they found 36 places where dog genes stray from those of the wolf.

　　Some of these genes have to do with brain, but a surprising number help pooches process carbs.

　　That metabolic¹⁰ trick may have made it easier for dog to stomach hanging around with humans, particularly once people start farming.

　　The left over grains in the scrap¹¹ may have attracted animals that over time evolved in the ability of carbo-load, and ultimately convinced them to stay.

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