When was the Cretaceous period?
Cretaceous

Tyrannosaurus rex, one of the largest land predators of all time, lived during the late Cretaceous.
Up to 2 m long and 0.5 m high at the hip, Velociraptor was feathered and roamed the late Cretaceous.
Triceratops, one of the most recognizable genera of the Cretaceous
A pterosaur, Anhanguera piscator
Confuciusornis, a genus of crow-sized birds from the Early Cretaceous
Ichthyornis was a toothed seabird-like ornithuran from the late Cretaceous period
