Tropical feedback loop: Butterfly mimicry patterns evolve faster near the equator

In the early 1990s, Keith Willmott and a friend, both undergraduate students from the United Kingdom, arrived in Ecuador with impressionable minds and big aspirations. Willmott initially imagined there might be 20 to 30 butterfly species in the region that had yet to be described; once those had been named, writing field guides would be a mere matter of taking a few photos and spelling out where everything lived.

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