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For such a big animal, polar bears sure start out small! A cub is about the size of a stick of butter when it is born. It is born hairless, with its eyes closed. Milk from polar bear mothers is 35 percent fat; this helps the cubs grow quickly.

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Although they are sometimes shown in movies as being mean or scary, gorillas are very gentle animals. They live in groups called troops that contain a silverback, many females, and offspring. The troop travels around the forest together looking for food during the day.

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Koalas are known as picky eaters. There are hundreds of different types of eucalyptus, but koalas only eat a few dozen kinds. And koalas won't eat every leaf off of each branch. In fact, at the San Diego Zoo, we offer each koala 25 pounds of fresh eucalyptus each day, and each only eats about 1.5 pounds of it.

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The honey badger's 2-tone coat covers skin that also helps the animal survive. Not only is its skin tough, it's loose enough that a honey badger can turn around in it and bite its attacker. And speaking of bites, the honey badger can survive the bites of some very dangerous creatures.

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Brown bears are brown, right? Well, maybe! They come in all sizes and shades, from a light cream color to almost black. Grizzly bears are a type of brown bear, but not all brown bears are grizzlies! Brown bears can be found in northwestern North America, northern Asia, Europe, northern Africa, and the Middle East.

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Lions live in groups called prides. There can be from from 3 to 30 lions in a pride. A pride contains many females and their young, and a few males. The lionesses rule the pride, working together to hunt and raise the cubs. But the adult males play an important role as well.

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Orangutans spend most of their lives in trees forests in Sumatra and Borneo. They get their food from the trees, and they build nests in the branches to sleep in. Their long arms help them swing from tree to tree. They use their hands and feet to grab and hold tree branches and food.

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Ring-tailed lemurs are practically noiseless as they move through the forest in Madagascar, and their reflective eyes can make them look a little spooky. Even their calls sound a little ghostly.

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At first glance, African elephants look similar to Asian elephants, but they are different species that live in different parts of the world. Here are some helpful clues for telling the 2 species apart: African elephants have very large ears that are shaped like the continent of Africa, while Asian elephants have smaller ears.

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Adult meerkats take turns acting as guards while the others look for food. The guard climbs to the top of the highest rock, termite mound, or bush it can find. Then it stands upright on two legs to get a good look around. If the guard spots danger, it alerts the others with a bark or whistle.

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Cheetahs are not strong predators, but they are fast. They rely on their speed-up to 70 miles per hour-to catch their prey. Everything about the cheetah is built for speed, from their non-retractable claws that act like cleats for traction, to their long tail that works like a rudder to help them change directions quickly.

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For a long time, scientists weren't sure if giant pandas were bears or perhaps more closely related to raccoons. Now we know that giant pandas are indeed members of the bear family, similar to other bears in their general looks and the way they walk and climb.

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Is a zebra white with black stripes or black with white stripes? It's a tricky question! A zebra's coat is white with black stripes, but under that fur, the animal's skin is black. So it all depends on how you look at it!

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Giraffes are the tallest land animals. A giraffe could look into a second-story window without even having to stand on its tiptoes! A giraffe's 6-foot-long neck weighs about 600 pounds. The legs of a giraffe are also 6 feet long. The back legs look shorter than the front legs, but they are about the same length.