Carnivore Animals that eat other animals.

Cretaceous era The geologic era between 135 million years ago and 64 million years ago.

Cretaceous Seaway A shallow ocean in the area now called the Great Plains.

Genera Plural of genus (a level of classification that usually includes several species with closely related structures and ancestry).

Herbivores Animals that eat plants.

Intestate Without a will.

InvertebratesAnimals without a backbone.

Kicked the bucket Died.

Mesozoic Era The geological period from 225 to 65 million years ago.

Paleontologist A scientist specializing in the study of prehistoric life forms.

Radiation The evolution of several species from a single ancestor.

Temerity Chutzpah.

Vertebrae Bones of the spinal column.

©1999, University of Wisconsin, Board of Regents.