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段落1

This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.

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We usually think of evolution as something that happens over eons, in remote places where people rarely venture.

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Not something that happens around the backyard birdfeeder in just a few decades.

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But a study in the journal Current Biology suggests that feeding birds in winter can influence their course of evolution.

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The birds in this study were central European blackcaps, a common kind of warbler.

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In spring, they breed in southern Germany.

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And when winter comes, they all fly south to the Mediterranean.

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At least they used to.

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In the 1960s, folks in Britain started putting out seed in winter.

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And the blackcaps split into two distinct groups.

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One goes to Spain to nosh on fruits and olives, the other heads north to take advantage of the easy English pickin's.

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The two populations may even be splitting into two species.

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The blackcaps that winter in England tend to mate with each other when they return to Germany.

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So they're starting to look different from the birds that go south.

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Their beaks are longer and narrower, less suited to supping on Spanish olives.

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As birds of a feather, they definitely flock together.

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And to some degree, they have a bunch of bird-feeding Brits to thank.

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Karen Hopkin.

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