has such prodigious snow cover that even downtown clover can stay pretty well insulated,
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.
The clover study with its multiple cities illustrates one opportunity that analyzing urban adaptation provides. “It’s basically a replicated evolution experiment,
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,” says Jason Munshi-South of Fordham University in Armonk, N.Y.,
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, where his lab studies local rodents and pigeons. ?Comparing cities “is where we need to go.”
Urban evolution, says Kristin Winchell of the University of Massachusetts Boston,
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, “is a very young field,
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, growing very fast.” She presented her latest data June 20 in her ongoing project to put together the first comprehensive picture of how a lizard is adapting to urbanization. Puerto Rico’s agile, abundant Anolis cristatellus lizards have colonized dense cities despite the perilous open expanses between urban trees. City lizard legs tend to be 2 to 5 percent longer than those of their forest counterparts,
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, and the elaborate toe pads that help the lizards skitter up walls have more folds, she and her colleagues reported in the May Evolution.
Urban lizards may need all the anatomical advantages they can get to race around cities: The smoothest thing a lizard copes with in the wild,
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, a leaf, is much rougher and easier to grip than a smooth metal surface. Videos of lizards dashing up slanting lab racetracks show varying footwork abilities, typically better among urban residents. While the lizards’ origins weren’t indicated, in one video, a lizard darts up the slippery unpainted aluminum surface, pauses, then shoots to the end,
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, beating

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