A brief video discussing the differences between Black Bears and Grizzly Bears. The video describes how to identify one from the other.

A kids-oriented slideshow which gives information about several kinds of wildlife tracks commonly found in the Grand Teton National Park.

A visually stunning, informative video geared towards preparing visitors of the Grand Teton National Park for encountering wildlife. The video outlines safe distances and appropriate behaviors for wildlife encounters.

Yosemite National Park: Dr. Fristrup, the senior acoustic Specialist with the National Park Service's Natural Sounds Program, talks about the effect of noise on predator-prey relationships, animal communications, and on human physiology.

Yellowstone National Park: The history of human-bear interactions involving food at Yellowstone are covered in this video. The reasons why visitors are currently discouraged from feeding bears at the park are discussed as well.

Yellowstone National Park: This video covers both native and invasive species of trout that are found in the waters at Yellowstone. The physical characteristics of each of the five species are covered in detail. Cutthroat trout are native and must be released if caught!

Redwood NP: The migration patterns, parent-child relationships, physical characteristics, and diets of barn swallows are discussed briefly.

Redwood NP: Park ranger Shaina discusses Roosevelt elk. Reproductive behavior, where to see them in the park, and how to observe the elk safely are all mentioned.

Gateway NRA: Park ranger Dave Taft discusses various species of hawks and where they can be spotted in the Gateway National Recreation Area.

Grand Canyon NP: Park rangers Ron Brown and Pat Brown discuss the birds at Grand Canyon National Park with special emphasis on their migratory patterns.

Grand Canyon NP: This episode is dedicated to ravens. Learn about their distinctive physical characteristics, where they can be found, what they eat, and much more.

Glacier National Park: USGS research biologist Kate Kendall discusses a project to estimate population and distribution of grizzly bears in Glacier National Park and surrounding areas. The method of collecting hair samples from bears is mentioned.

Denali NP & PRES: Discovery of a set of intertwined moose antlers and skulls in a designated federal wilderness area inspires discussion and deeper appreciation of wilderness values.

Canyonlands National Park: Once faced with extinction, the desert bighorn sheep has made a remarkable comeback in southeast Utah thanks to native herds protected in Canyonlands. Join ranger Karen Henker for an in-depth look at this intriguing mammal.

Canyonlands National Park: Throughout Canyonlands, naturally occurring sandstone basins called potholes form tiny ecosystems inhabited by a surprising collection of animals. Join ranger Karen Henker for an introduction to these animals and some their remarkable adaptations.

Rocky Mountain National Park: This video discusses bighorn sheep with emphasis on their movement around the park. Struggles they face due to human ingenuity are discussed as well as how park officials help the sheep overcome man-made obstacles.

Natural Laboratory: Where have all the black abalone gone? How are scientists surveying the remaining population? Why are black abalones eating so much? Tune in for answers to these and related questions.

Natural Laboratory: Tune in to find out how deep-water corals are beneficial to an array of different marine organisms and the factors that could harm the corals. Information is provided by experts at the Cordell Bank National Marine Sanctuary.

Natural Laboratory: Due to higher carbon dioxide output, the oceans have become increasingly acidic. How is this acidity affecting marine organisms with shells? Tune in to find out.

Natural Laboratory: This audio file covers attracting great white sharks to boats so that they can be documented and tagged. They types of tags used are discussed as well as the migration patterns of the great white sharks found off the California coast.

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.