What makes a marsupial, a marsupial? The biogeographic history and biological evolution of this particular infraclass of mammals.

The crocodile has few natural predators, an armor of bony plates covering most of its body and strong jaws capable of crushing anything from bones to cast iron.

The American bald eagle is a highly specialized predator. But what is the evolutionary background that allows the bald eagle to pull off its amazing maneuvers?

Of all the troglobites, it is perhaps the olm that is the star. Troglobites are built to survive in the dark cave systems below the earth's surface.

Using segments from NATURE: "Moment of Impact, Part 2: Jungle," students will learn about skills and features that help species survive in the jungle.

These video excerpts from the NATURE episode, “Moment of Impact: Part 2, Jungle" accompany the lesson plan, It’s a Jungle Out There: How Species Survive in the Jungle.

During this video-enhanced lesson, using clips from NATURE's "Dogs that Changed the World," students will learn that all dogs came from one ancestor- the wolf. (Grades 5-8)

These clips from NATURE's "The Wolf that Changed America," are used in the lesson, to show students that all dogs came from one ancestor- the wolf.

In this video-enhanced lesson, students will explore the concepts of adaptation and evolution as seen in different species of birds. (Grades 9-12)