The conventional view of the age of the dinosaurs is that mammals lived in the shadows until the day the asteroid hit, but a new analysis shows they were already evolutionarily primed to take over the world
by evolutionarily hedging their bets, generating an array of varied species that set them up to weather the prehistoric apocalypse, according to a new analysis.Jorge García-Girón
at the University of León, Spain, and his colleagues hoped to gain some insight into why mammals and other small creatures thrived after the impact while birds were all that remained of the dinosaurs. “I do not believe that selectivity favouring small-bodied animals alone can explain the difference between survival and extinction between mammals and dinosaurs,” says García-Girón. The real picture is much more complex and has to do with the spread of different diets, behaviours and niches that animals had before the impact, he says.
“It not only amazed me how mammals managed to thrive in the highly complex, and probably dangerous, dinosaur-dominated ecosystems,” says García-Girón, but how also how rapidly our ancestors moved into vacant niches after the asteroid hit. “Dinosaurs going extinct is certainly a captivating story, but they were just one of the many taxa that were dramatically affected by the… mass extinction,” says Lucas Weaver at the University of Michigan.
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