TED-Ed
Why Is Biodiversity So Important?
There are millions of plant and animal species on the planet, but why do we need so many? Follow along with this short video as it explains how biodiversity helps strengthen ecosystems, allowing them to adapt to change so that life...
PBS
Pbs Learning Media: Wolves of Yellowstone National Park
Discover why the gray wolves were important to Yellowstone National Park before they become extinct in that area. Find out how gray wolves were reintroduced back into this area. [5:19]
Next Vista for Learning
Next Vista for Learning: Keystone Species
A video explaining the definition of a keystone species. It also gives the example of a sea otter as a keystone species and what it does for its habitat. [1:14]