This video explores the critical role of salmon in an ecosystem, as well as efforts to reintroduce salmon nutrients into streams.

This video from NATURE explores the life and death of wild salmon in the Pacific Northwest.

This resource describes efforts to protect salmon by killing or relocating species that prey on salmon.

This video segment focuses on the annual “salmon run,” when brown bears descend on Alaska’s rivers to fish.

This excerpt from the PBS series NATURE examines how polar bears’ arctic habitat is literally falling into the sea as a consequence of global climate change, and how they may be helpless to adapt in time.

This excerpt from the PBS series NATURE explores how black bears native to Alaska are adapting to the expanding urban sprawl of Anchorage, and vice versa.

This video from NATURE explores sea turtles in Cuba--specifically, the role the country's beaches play in sea turtles’ lives and the threats facing the turtles. The segment also examines the efforts biologists in Cuba are taking to help sea turtles.

This video from NATURE examines Cuba's coral reefs, including the variety of corals, fish and other wildlife in the country’s tropical waters. The video also explores why Cuba’s reefs are so healthy in comparison with those elsewhere in the world.

This video from NATURE explores how three distinctive animals in Cuba--the smallest bird in the world, the smallest frog in the Northern hemisphere, and the country’s famous painted snails--interact with Cuba's wildlife and ecosystems.