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The charismatic otter, a member of the weasel family, is found on every continent except Australia and Antarctica. Most are small with short ears and noses, elongated bodies, long tails, and soft, dense fur. There are 13 species in totaL ranging from the small-clawed otter to the giant otter. Though most live in freshwater rivers, lakes, and wetlands, the sea otter and the smaller marine otter· are found in the Pacific Ocean. Webbed feet and powerful tails, which act like rudders, make otters strong swimme.rs. Their nostrils and ears close to keep water out and waterproof fur keeps them warm. They must carefully groom their fu.r and furry undercoat to keep them clean and sealed off to water, because they're not covered in a fatty layer like other seagoing creatures. Otters have the densest fur of any animal-as many as a million hairs per square inch in places. All otters are expert hunters that eat fish, crustaceans, and other critters. Sea otters have an ingenious method to op.en shellfish. A sea otter will float on its back, place a rock on its chest then smash the mollusk down on it until it breaks open. River otters are especially playfuL gamboling on land and splashing into .rivers ·and streams. They learn to swim when they are about two months old, when their mother pushes them into the water. Most otter species come ashore to give birth in dens, which sometimes have been used by other animals such as beavers. Sea otters are the exception, giving birth in the water. Baby otters, called pups or kittens, stay with their mothers until they're up to a year okJ, or until she has another litter. River otters don't breed until they're at least five years old. Adopted from: https:/ /www.nationalgeographic.comfanimals/mammals/group/otters/ (March 17, 2020) "Sea otters are the exception giving birth in the water' (Last paragraph) What does the underlined word refer to? A. Addition B. Omission C. Inclusion D. Reference

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