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A Mexican leaf frog, photographed near Alamos, Mexico. Both plant and animal species in the tropics, like this frog, were found to occur over a narrower range of temperatures than temperate species, which may make tropical species much more vulnerable to (Photo: John J. Wiens) A Mexican leaf frog, photographed near Alamos, Mexico. Both plant and animal species in the tropics, like this frog, were found to occur over a narrower range of temperatures than temperate species, which may make tropical species much more vulnerable to climate change.