Researchers have debunked the prevalent theory that mammals were not pervasive during the time of the dinosaurs after uncovering a previously unrecognized group of rodent-like creatures dubbed multituberculates. These unique mammals coexisted with dinosaurs for roughly 20 million years, able to do so because they fed off of plant-based food sources that were not in high demand from other species. Multituberculates were named for their teeth, which had special bumps and cusps for crushing plant fibers. Although they continued to thrive after the extinction of dinosaurs, they were eventually eradicated by growing populations of primates, hoofed animals, and rodents.
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