River otters never seem to get enough mud sliding! They slide down steep riverbanks and dive headfirst into the water. They may keep this up for hours.
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Scientists once thought stegosaur brains were only the size of a walnut—but more recent research shows they were about the size and shape of a crooked hot dog.
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Most cats can walk so silently that nobody can hear them coming. Some can climb trees in the twinkling of an eye, and some leap so lightly they almost seem to fly.
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