In this podcast, biologist Maydianne Andrade explains that sexual cannibalism-a gruesome mating behavior shown of Redback Spiders-is a prime example of how evolution works.Podcast produced by David Levin. Interview by Josh Seftel. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers.Major funding for NOVA scienceNOW is provided by the National Science Foundation and the Howard Hughes Medical Institute. Additional funding is provided by the Alfred P. Sloan Foundation.This material is based upon work supported by the National Science Foundation under Grant No. 0229297. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.For more fun science stories, visit our website at pbs.org/nova/sciencenow