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The beating tail of a swimming fish creates vortex rings (blue) in its wake. Predators detect their prey via such wake structures, which can persist for over one minute. [Jan-Moritz P. Franosch, Hendrik J. Hagedorn, Julie Goulet, Jacob Engelmann, and J. Leo van Hemmen, Phys. Rev. Lett. 103, 078102 (2009)] |
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