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Stream the full Mammals Season 1 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.

Very few mammals have managed to lose all ties with land and conquer life in water, one of the greatest challenges for an air breathing mammal. Those that have are some of the cleverest of all, forming surprising bonds not just amongst their own but with other species as well.