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Follow scientists as they search for new clues to how mammals moved from land into the sea to become the largest animals on Earth.

Animals big and small from across the globe go on epic journeys through streams and mountains to find a mate before its too late.

For generations, America’s national mammal, the buffalo, sustained the lives of Native people, whose culture intertwined with the animal.

A celebration of one of Earth’s most iconic and beloved birds, featuring all 18 species of penguins for the first time, from New Zealand, Cape Town, the Galapagos Islands and Antarctica.

Former Interior Secretary Stewart Udall leaves a legacy of conservation and environmental justice, inspiring people to work together.

From a baby whale in danger to marine iguanas battling storms to a mantis shrimp’s knockout punch, the spies are never far from trouble.

Peter Walsh is a Tasmanian obsessed with one of nature’s least understood and most unlikely creatures, the platypus.

With its magnificent coastline and densely wooded interior, Maine is a place where outdoor adventure has a long history.

Early Earth was a hellscape of molten lava and barren rock, bombarded by meteors. How did our familiar blue sky come to be?

At the planet’s frozen extremes, shifts in animal movement and behavior reveal vital information about our future world. Examine polar bears in the Arctic, penguins in Antarctica and other animals surviving in icy worlds.