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Each episode focuses on aquatic wildlife in part of the ocean's waters, at different depths, of different origin and composition. This provides different challenges and opportunities, to which species adapt along a complete food chain, from microorganisms and fish to their predators, including birds and mammals.
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Episode 1
The blue seas are full of aquatic life, such as many species of fish and their predators. Some species are huge, like whales, other rather fast, like dolphins, or ancient, like sharks. Many migrate.





