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. Funding for NOVA scienceNOW is provided by the National Science Foundation, the Howard Hughes Medical Institute, the Alfred P. Sloan Foundation, and PBS viewers.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.NOVA is produced by WGBH in Boston. Funding for NOVA is provided by David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and PBS viewers.For more fun science stories, visit our website at pbs.org/nova/sciencenow