Yellowstone National Park: Celebrity bears, and a tale of two trout

You can’t come to Yellowstone without thinking about the grizzly bear. This thriving ancient ecosystem is like a sacred space for them. And a critical source for food which they are constantly in search of in order to get the needed calories that will sustain them through their long winter sleep. …

Glacier Bay National Park: Life after ice - the birth of a river

Melting ice is usually bad news, but this place in Alaska has turned from frozen to flourishing in just 200 years.  Nestled in southeast Alaska, the stunning and famous Glacier Bay National Park is often called a “living laboratory.” Scientists from all over the world come here to study ecological…

Great Smoky Mountains National Park: Fireflies in synchrony

Once a year they come out, by the thousands. Fireflies. But these aren’t just any fireflies. These are Photinus Carolinas, also known as synchronous fireflies They blink on and off together. It’s an amazing site. On this episode, I head to Great Smoky Mountains National Park to experience the synch…

Everglades National Park: Invasion of the Burmese pythons (reprise)

In the Florida Everglades, the Burmese python is an invasive species that's close to triggering an ecological collapse. We'll head out with python hunters who track down these massive snakes for a bounty. Then we wade through the waste deep murky waters of the Everglades to see what researchers are…

Cuyahoga Valley National Park: Toxic wasteland to ecological champion

Cuyahoga Valley National Park is nestled between Akron and Cleveland, Ohio. It once was an industrial wasteland, filled with debris from the nearby auto factories. The Cuyahoga river was so polluted that it literally caught fire. That fire was a moment that sparked an environmental movement. But I'…

Death Valley National Park: Diving for fish in the hottest place on Earth

Chris joins a team of scuba divers...in the desert!  Death Valley National Park is the hottest place on Earth and the driest place in North America. The heat that builds beneath Death Valley’s cloudless skies radiates off barren rocks and sinks into the valley bottoms, where it warms, baking every…

North Cascades National Park: The wolf comes home

One day, Chris was on the search for a very rare animal: a single wolf that had made it to the western side of the North Cascade mountains. That day, to his amazement, he found a set of fresh tracks on a sandy riverbed. Wolves had been extinct here in Washington state for nearly a hundred years, so…

Biscayne National Park: Raising baby corals in America's barrier reef

How scientists are training corals to be ready for a warmer future. Biscayne National Park is unlike any other national park…it’s 95% underwater. It’s home to part of the third largest coral reef in the world and the only living coral barrier reef in the continental United States.  But this past …

Redwood National Park: Saving the tallest trees on Earth

Discover why scientists are chopping down redwood trees… to save them. Redwood National and State Parks are home to some of the tallest trees on Earth, coast redwoods. These ancient California forests support hundreds of different species, and store more carbon than any other forest on the planet.…