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    Lending a Helping Paw: When Animals Cooperate [Slide Show]

    Competition has been a vital force in the evolution of life on Earth, but it has not acted alone. Cooperation, too, has played an essential part. So argues mathematical biologist Martin Nowak of Harvard University in the cover story of the July 2012 issue of Scientific American. The slide show below pictures some of the many creatures known to assist those in need.

    » View the slide show

    Follow Scientific American on Twitter @SciAm and @SciamBlogs. Visit ScientificAmerican.com for the latest in science, health and technology news.
    © 2012 ScientificAmerican.com. All rights reserved.

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