01 November 2019
Vol 366, Issue 6465

About The Cover

Cover image expansion

COVER Heliconius melpomene (left) and H. erato (right) gained protection from predators by evolving similar warning colors, an example of Müllerian mimicry. These species are among 20 sequenced butterfly genomes that illustrate the importance of hybridization and gene flow in genomic evolution. See pages 570 and 594.
Photo: Andrew Neild