Moor frogs (Rana arvalis) ready to breed in spring. The world is warming faster at higher latitudes. As a result northern populations of amphibians advance their breeding dates more than populations closer to the equator. But amphibians at higher latitudes are also more responsive to increased temperatures, which exaggerates the direct effect of global warming on breeding phenology at high latitudes (see While and Uller, this issue). Photo by Jörgen Sagvik.

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