All kids like dinosaurs, right? Well, mega-mammal Meg Atherium wants kids to know that dinosaurs weren't the only super-interesting, super-sized creatures in prehistoric times; in fact, giant mammals like saber toothed tigers, woolly mammoths, and 20 ft. tall land sloths (megatheriums) once dominated our planet. Meg thinks these massive mammals of the Pleistocene epoch deserve some long overdue publicity, so she's spearheading a campaign to replace all those over-exposed dinosaurs (in movies, on TV shows, in picture books, on lunch boxes . . .) with the mega-mammals from her own (very-important) time.