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Learn about the mechanical properties of birds’ nests from Yale University structural engineer Corey O’Hern in this video from NATURE: Animal Homes.

This media gallery from NATURE: Invasion of the Killer Whales examines how global warming is impacting arctic ice, polar bears and the permafrost.

Learn how global warming is impacting the arctic region and opening the door to killers whales, a region once off-limits to this marine animal, in this media gallery from NATURE: Invasion of the Killer Whales.

This video from NATURE: Invasion of the Killer Whales describes the arctic region, what animals live there and how they have adapted to this inhospitable environment.

Meet a very unique animal – the sloth – in this video from NATURE: A Sloth Named Velcro.

In this video from NATURE: A Sloth Named Velcro, watch how scientists investigate the natural world with an experiment that measures sloth brain activity to examine just how often wild sloths sleep.

Learn about a rare species, the pygmy sloth, and how it has adapted to its aquatic environment in this video from NATURE: A Sloth Named Velcro.

Use this video and supporting materials from NATURE: Orangutan Eden to examine how orangutans make and use tools

Learn about the deforestation of Sumatra and the resulting displacement of orangutans in this video and supporting materials from NATURE: Orangutan Eden.