PBS
Nova: The Extinction Enigma
45,000 - 50,000 years ago the megafauna of Australia became extinct. This interview investigates several possible causes such as, continental drift, human impact, and climate change.
Other
Buzzle.com: Animal Sake: Triassic Period Animals
Brief descriptions of the climate of the Triassic Period and of the plants and animals. Includes a lengthy list of the animals that lived during that time.
Other
Buzzle.com: Animal Sake: Precambrian Animals
Describes several types of organisms that lived in the Precambrian Era and provides a list of others. Some of these still exist today.
Math Science Nucleus
Math/science Nucleus: Mammoth Mary Animation
This animation, in a storybook format, discusses a wide variety of prehistoric animals from the mammoth to the mastodon.