<Li> <P> Confuciusornis, a genus of crow - sized birds from the Early Cretaceous </P> </Li> <P> Confuciusornis, a genus of crow - sized birds from the Early Cretaceous </P> <Li> <P> Ichthyornis was a toothed seabird - like ornithuran from the late Cretaceous period </P> </Li> <P> Ichthyornis was a toothed seabird - like ornithuran from the late Cretaceous period </P>

What did the earth look like during the cretaceous period