About This Quiz
When you think of marine life, you probably think about scaly fish with gills, but there are a variety of aquatic mammals that breathe air. So hold your breath and dive into the marine mammals quiz!By considerable measure, the largest known animal on Earth is the blue whale. Mature blue whales can measure anywhere from 75 feet (23 meters) to 100 feet (30.5 meters) from head to tail, and can weigh as much as 150 tons (136 metric tons).
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Orcas, or killer whales, which are known for their fierce group-hunting style, have been called the "wolves of the sea."
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Instead of pearly whites, baleen whales have plates with coarse broomlike bristles -- sort of like a mustache instead of teeth.
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Beaked whales can hold their breath for up to two hours.
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Narwhal tusks are made of ivory.
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A dolphin's sonar process, also used by bats and some whales, is called echolocation.
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Walruses possess anywhere from 400 to 700 whiskers, arranged in 13 to 15 rows around the nose. These whiskers, also known as vibrissae, are attached to muscles and are supplied with blood and nerves, which makes them highly sensitive in order to detect prey.
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True seals have no external ears, while sea lions (and fur seals) do.
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Whale vomit, or ambergris, can fetch between $10 and $20 per gram. Ambergris is used as an ingredient in fine perfume because of its unique odor and ability to make a scent "stick" to the skin.
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Both are toothed whales, but dolphins have pointy, cone-shaped snouts, while porpoises have rounded ones.
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