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14 Questions About Aquatic Animals Answered
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A tiger shark, Galeocerdo cuvier, swims in clear, shallow water above a sandy and rocky sea floor. Illustration of a blue whale (Balaenoptera musculus) showing its massive size, with a human swimmer and an elephant for scale. The whale is depicted in profile, emphasizing its long, streamlined body and distinctive blue-gray coloring. Text indicates the blue whale can reach 29.5 meters (97 feet) in length. walrus (Odobenus rosmarus) Illustration of a tropical two-wing flying fish (Exocoetus volitans) showing its long, wing-like pectoral fins and streamlined silvery-blue body, with a scale bar indicating size. electric eel (Electrophorus electricus) porcupine fish Several Pacific salmon leap up a rushing waterfall in Brooks River, Katmai National Park, Alaska, as they swim upstream to spawn. A hermit crab, Coenobita species, with bright orange legs emerging from a large spiral shell on sandy ground. Illustration showing a cross section of a coral polyp with labeled parts including tentacles with nematocysts, mouth, zooxanthellae, living tissue linking polyps, gastrovascular cavity, skeleton, and limestone calice. An inset details a nematocyst within a tentacle. A pregnant male seahorse with a swollen belly clings to a plant stem in an aquarium, surrounded by yellow aquatic plants and white gravel.
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14 Questions About Aquatic Animals Answered: Media

Find out more about animals that live underwater.
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Images

tiger shark
Tiger shark (Galeocerdo cuvier).
© Ian Scott/Shutterstock.com
blue whale
Blue whale (Balaenoptera musculus).
Encyclopædia Britannica, Inc.
walrus (Odobenus rosmarus)
In the walrus (Odobenus rosmarus), both males and females have tusks.
© Corbis
tropical two-wing flying fish
Flying fishes, such as the tropical two-wing flying fish (Exocoetus volitans),...
Encyclopædia Britannica, Inc.
electric eel (Electrophorus electricus)
Electric eels (Electrophorus electricus) have three electric organs—the...
© Brian Gratwicke; used with permission
porcupine fish
Porcupine fish (Diodon hystrix).
© stephan kerkhofs/Shutterstock.com
Sockeye salmon
Sockeye salmon (Oncorhynchus nerka). The chemical characteristics of a salmon's...
© Sekarb/Dreamstime.com
Decapod
Hermit crab (Coenobita sp.).
© Sergey Khachatryan/Shutterstock.com
coral polyp
Cross section of a generalized coral polyp.
Encyclopædia Britannica, Inc.
pregnant male seahorse
Pregnant male seahorse foraging for food at the bottom of an aquarium.
© huxiaohua/Shutterstock.com