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Butterflies fast forward evolution

A population of butterflies has evolved in a flash on a South Pacific island to fend off a deadly parasite. The proportion of male Blue Moon butterflies dropped to a precarious 1 percent as the parasite targeted males. Then, within the span of a mere 10 generations, the males evolved an immunity that allowed their population share to soar to nearly 40 percent, all in less than a year. "We usually think of natural selection as acting slowly, over hundreds or thousands of years," said study team member Gregory Hurst, an evolutionary geneticist at the University College London. "But the example in this study happened in a blink of the eye, in terms of evolutionary time."
Butterflies fast forward evolution to evade death - LiveScience -

nature, development