Butterfly 'eyespots' add detail to the story of evolution

(Oregon State University) A new study of the colorful 'eyespots' on the wings of some butterfly species is helping to address fundamental questions about evolution that are conceptually similar to the quandary Aristotle wrestled with about 330 B.C. -- 'which came first, the chicken or the egg?' After a couple thousand years, we're getting closer to the right answer.