What's Brought 32,000 Parakeets to London's Suburbs?

Photo: challiyan under a Creative Commons license.

In April, Brian lamented new population maps that show Americans are still moving to the suburbs. But the study was restricted to the United States, and only looked at human population shifts. Which means that it offers no help in solving a mystery that's troubling British scientists: why have tens of thousands of rose-ringed parakeets, native to India and Africa relocated to London's suburbs in the last fifteen years?

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