This is a podcast covering the Cretaceous period of the Mesozoic Era. It describes the climate and geography of the period (145-66 million years ago), detailing major dinosaur groups including Tyrannosaurus rex, Triceratops, dromaeosaurids (raptors), hadrosaurs (duck-billed dinosaurs), ceratopsians, ankylosaurs, and pachycephalosaurs. The explores their unique features, behaviors, and evolutionary adaptations while emphasizing the diversity of Cretaceous ecosystems. It concludes by discussing the asteroid impact that caused the extinction of non-avian dinosaurs while highlighting that birds are modern descendants of theropod dinosaurs.