If you're a small animal in a cold environment, being standoffish is a bad survival strategy. That's why animals of many kinds huddle for warmth. They put their furred or feathered bodies right up against their neighbors' and conserve energy that they would otherwise spend heating themselves. One especially adorable huddler is the degu (Octodon degus), a rodent that lives in Chile and has a tail like a paintbrush. As temperatures drop, degus clump into cuddling groups to keep warm. A new
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