Where would humans be without chickens?

Andrew Lawler, author of “Why Did the Chicken Cross the World? The Epic Saga of the Bird that Powers Civilization,” sheds light on the humble chicken, which he says has played a more vital role in human history than any other animal — including cats, dogs, cows and pigs. From the dinner table to backyards to infectious disease laboratories, “humans can’t do without chickens,” Lawler said. National Geographic News (free registration) (12/21)

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