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Monarch butterflies may once have been the most abundant species of butterfly on the entire planet, but their population has dwindled down to less than 10% of what their numbers used to be. Biologists think they form large clusters for warmth, largely in part to to them not being able to fly below 55F and so are frozen in a sort of suspended animation.
Overwintering, roosting butterflies have been seen on sumacs, locusts, basswood elm, oak, osage orange, mulberry, pecan, willow, cottonwood, and mesquite. In addition, they also need plenty of sunlight.
Working with and thanks to the Pacific Grove Museum of Natural History.
Spotted on Dec 18, 2014
Submitted on Dec 23, 2014
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