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 ...

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 ...