The Darwin’s emerald moth is a neat trick of evolution: The larvae change color depending on what they eat. And they seem to do it visually — put them in the dark and they fail to match their host plants.
Naturalist and illustrator John Muir Laws is the author of the Laws Field Guide to the Sierra Nevada and Sierra Birds: A Hiker's Guide. Learn more and find class schedules at johnmuirlaws.com.
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