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Stream the full Nature Season 37 Episode 3 movie online for free in crystal-clear HD quality. No downloads required—just press play and enjoy the action, complete with English subtitles for an enhanced viewing experience.

Scientists are studying cats in greater detail than ever before. New approaches and technologies help uncover some of the cats' most intimate secrets, including the cheetah's remarkable gymnastic abilities and why lions are able to hunt so cooperatively. Conservationists are fighting to protect the most endangered species around the globe, such as the Iberian lynx, once considered the rarest cat on the planet.