Interval of geologic time from 0441; 144 to 65 million years ago.
During the Cretaceous the climate was warmer than today. In the seas, marine invertebrates flourished, and bony fishes evolved. On land, flowering plants arose, and insects, bees in particular, began their thriving partnership with them. Mammals and birds remained inconspicuous throughout the Cretaceous, while the reptiles continued their dominance. The dinosaur s reached the peak of their evolution during this period but rather suddenly became extinct at its end.