A new study reveals that behavioral isolation between populations of Bahamas mosquitofish is driven primarily by the actions of females—not just through mating choice behaviors, but also through ...

Together, these results indicate that the single genetic swap probably set speciation in motion, Uy said. "I think we do have a speciation gene because this substitution creates a different physical ...

Because iguanas are large and easily observed, they are one of the more conspicuous examples of speciation on oceanic islands. To see a larger image, click here. Photo by Jeff Mitton. A ...

In a matter of months, butterflies sporting the yellow and red wing color pattern of a wild species were created through simple laboratory crosses of two other wild species, researchers report in the ...

Biologists drove the divergence of different-sized feather lice from a single population. In four years, the evolved lice had trouble mating with each other -- a sign of speciation. A few years ago, ...