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Monarch Butterflies Resting in Tree, Pacific Grove, California

Thousands of monarch butterflies (Danaus plexippus) rest in a tree in Pacific Grove, California. The flight muscles of a monarch butterfly do not work well unless the temperature is above 55 degrees Fahrenheit (13 Celsius), so during the winter they cluster in large masses to conserve heat.

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Thousands of monarch butterflies (Danaus plexippus) rest in a tree in Pacific Grove, California. The flight muscles of a monarch butterfly do not work well unless the temperature is above 55 degrees Fahrenheit (13 Celsius), so during the winter they cluster in large masses to conserve heat.