Visitors to the American Museum of Natural History in New York inspect a detailed model of a 60-foot-long Mamenchisaurus at "The World's Largest Dinosaurs'" exhibit. The exhibition explored the biology of the long-necked and long-tailed sauropods. A new study in the journal Current Biology suggests that sauropods produced enough methane, through burps and flatulence, that it helped keep an already warm Earth warmer. (Associated Press)
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