Natural Laboratory: Why are populations of native Olympia oysters in Tomales Bay not recovering although they have not been harvested for nearly a century? Tune in to find out.

Natural Laboratory: Listen to this audio file to learn about Humboldt squid. In recent years these squids have been frequenting waters off of the California coast. Biologists search for the reason behind this unusual behavior.

Natural Laboratory: What is being done to restore the population of tidewater gobies in the Tomales Bay watershed? Tune in to find out.

Natural Laboratory: Tune in to learn about tracking Coho salmon and other fish species through electrofishing.

Natural Laboratory: What pollutants are present in harbor seals, how do the seals absorb these pollutants, and what testing is conducted to determine the level of contamination of the seals? Tune in to find out.

Natural Laboratory: Join the search for one of the ocean’s great hunters, the white shark. Learn how these sharks are tracked in the northern Pacific Ocean and what the aims of the current research are.

Hawai'i Volcanoes NP: This is a video dedicated to the Hawaiian Petrel, or `U`au. The life cycles of these seabirds is discussed along with reasons they are threatened by extinction and what the park is doing to protect them.

Mojave National Preserve: Listen to the story of how the Mohave tui chub were accidentally rescued from extinction and what efforts are currently being undertaken to ensure that the species of fish does not become extinct.

Redwood NP: A park ranger discusses the movement, diet, shelter, and physical characteristics of banana slugs.

Denali NP & PRES: Paleontologist Dr. Anthony R. Fiorillo answers a number of questions on the topic of dinosaurs. Topics include theropods, hadrosaurs, migration, adaptations, fossils, footprints, and diet, among others.