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. 2014 May 6;11(94):20131208. doi: 10.1098/rsif.2013.1208

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© 2014 The Author(s) Published by the Royal Society. All rights reserved.

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Figure 1. — (a) Flock of sheep in Argentina avoiding the shepherd in the middle. (Photograph by Yann Arthus Bertrand, used with the permission of the author.) (b) A farmer walks 5000 ducks in Taizhou, China. (Source: BBC news.) (c) A baitball of sardines under attack by diving gannets. (Source: The Telegraph, Jason Heller/Barcroft Media.) (d–g) A flock of ducks in Vancouver, Canada, being pursued by a kleptoparasitic gull. Snapshots taken 2 s apart showing complex pursuit dynamics. (Photographs by Ryan Lukeman, used with the permission of the author. Photographs (e,f) also appear in [11].) (Online version in colour.)