Mammals reached a weight of about 13 pounds within 100,000 years of the extinction event. By 300,000 years after their extinction, they reached a weight of 55 pounds (25 kg), becoming the first purely herbivorous mammalian species. Some mammals weighed more than 110 pounds by 700,000 years after the asteroid.
In the early Paleogene, which was the time after the Cretaceous, it appears from the bones of extinct mammals that they became more terrestrial. According to Professor Janis, the increase in understory vegetation is to blame. "Bushes and shrubs beneath the tree canopy were now a more suitable habitat for these small mammals," she claimed.
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