They're surprisingly fuzzy. Each wing looks like a mini-masterpiece of stained-glass art, in orange, black, and white.

But yeah, it's all the heat. It's all the sun. Anderson Cooper: You can actually hear the sound of butterfly wings. Court Whelan: Yeah. Anderson Cooper: Let's just be quiet for a second.

Up at Monterey’s Pacific Grove butterfly site, the numbers have been the low hundreds. Hiking along the otherwise peaceful trails at Ellwood, the sound of a drill whirring or a truck beeping can be ...

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