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Thousands of Monarch Butterflies cluster together in order to conserve heat during the winter months. Every year more than 25,000 Monarch Butterflies huddle together on the pine and eucalyptus trees of Monarch Grove Sanctuary in Pacific Grove, California. They cluster in large masses to conserve heat and energy as their flight muscles do not function well unless the temperature is above 55 degrees. Picture: Michael Yang / Rex Features
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head down to Pacific Grove! I visited...late February when most of the butterflies have...
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