DK Find Out! Fish

Around 50 percent of all the species of backboned animals alive today are fish. Dumpling Mountain (Katmai National Park)

The Katmai wilderness opens before you through this mountaintop cam.

Crash Course Kids: A Fresh Future - Episode 33.2
Crash Course Kids

In this episode of Crash Course Kids, Sabrina talks about a few different examples how some freshwater sources were good, then bad, then made good again.