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How many species of aquatic mammals are there?

April 26, 2017aquatic mammals Mathematics species zoology

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How many species of aquatic mammals are there?

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Marine mammals are a diverse group of roughly 120 species of mammal that are primarily ocean-dwelling or depend on the ocean for food. They include the cetaceans (whales, dolphins, and porpoises), the sirenians (manatees and dugong), the pinnipeds (true seals, eared seals and walrus), and several otters (the sea otter and marine otter).