From glasswing butterflies to vanishing octopuses, evolution sometimes paints with colors that aren’t there.
While trekking through the Peruvian rain forest, an eight-hour boat ride from the nearest jungle settlement, biologist Aaron Pomerantz saw what seemed like tiny invisible jets zipping across the trail. “I was out there with a net trying to catch things,” he says, “and these just changed direction and vanished.”
It was his first close encounter with clear-winged butterflies, insects that inhabit Central and South American forests
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