Angiosperms (plants with flowers) develop throughout the Cretaceous, until establish 90 % of the flora.
During the Cretaceous, Insects continue their evolution and become similar to those who populate at present the globe.
The number of the families of Bryozoaires grows from Cénomanien to Campanien, stabilizes in Maastrichtien.
Bivalves are particularly represented by Inocérames.
The adaptation of Ammonites in the middle of seas épicontinentales is translated by the appearance of numerous more or less unwound forms, Turrilites, Scaphites or Baculites. The sorts of Ammonites and Bélemnites are reduced during the Cretaceous, particularly between Albien and Santonien, then between Campanien and Maastrichtien: these groups are close to the extinction well before the end of the Cretaceous. Ammonites disappears more than one hundred thousand years before the limit Cretaceous - Tertiary sector.
The diversity of marine osseous Fishes exploded in the Cretaceous, there is 100 million years.
The Reptiles develop in the Cretaceous, for example Tyrannosaurs on dry land, the Plésiosaures, the Mosasaures, the huge Tortoises in seas, and Pterosaurs in the airs. A first wave of extinctions begins at the end of Campanien, that is eight million years before the Crétacé-tertiary limit.
In the Cretaceous, the real birds are already present, Mammals also but they remain however very small-sized.