A chipmunk gathers nuts for the winter, amassing about 6,000 of them by end of fall. But he needs to keep an eye out for pickpockets...

An acorn woodpecker guards its carefully stashed nuts from a very hungry and persistent squirrel.

The adorable collared pika is as cute and cuddly as they come, that is unless you're a bird that's blown off course in the Alaskan wilderness...

Go behind the scenes of the alligator sequences with North America Cinematographer Sophie Darlington and Assistant Producer Ben Wallis.

This one-pound bunny, called a pygmy rabbit, gets into a high-speed chase with a long-tailed weasel.

In Mexico's Gran Desierto de Altar desert, a fringe-toed lizard outruns a sidewinder rattlesnake.

A team of Harris hawks work together to chase down a cottontail rabbit in the Sonoran Desert, weaving in and out of cacti as they home in on their prey.

North America's incredible sights and sounds come to life in our split-second highlight reel.

The amazing sights and sounds of North America's savage coasts come to life in our split-second highlights real.

Meet some of the world's rarest amphibians, housed inside the frogPOD. Did you know that up to half of all frog species could be gone in the next 20 years?

Follow the Racing Extinction team as they test a new camera that records carbon dioxide emissions in infrared.

The Cornell Wild Acoustical Laboratory has been collecting animal sounds since the 1930s. Among their collections are animals that have gone extinct.

Scientists and experts explain the effect that skyrocketing carbon dioxide levels are having on our oceans and coral reefs - and why it matters.

The biggest factor in mass extinction is converting natural animal habitat to land used for food production. See how our way of producing food is contributing to a major pollution problem.

Humans are rapidly driving many species to extinction. Hear the song of the last Kauai O’o bird and learn more about what is causing these mass extinctions.

Shawn Heinrichs recalls how he rescued a manta ray that was caught in a fishing line.