Caught in the act: Butterfly mate preference shows how 1 species can become 2

Scientists find a population of butterflies that appears to be splitting into 2 species

		IMAGE: Polymorphic mimicry in Heliconius cydno alithea in western Ecuador, where the white form mimics the white species Heliconius sapho and the yellow form mimics the yellow species Heliconius eleuchia.... Click here for more information.

AUSTIN, Texas—Breaking up may actually not be hard to do, say scientists who've found a population of tropical butterflies that may be on its way to a split into two distinct species.