Large scale and striking patterns of collective motion is observed in a wide range of organisms from cellular swarms and ant-trails to flocks of birds circumnavigating the globe. We study these fascinating systems by building simple computational models, try to understand how they arise from local interactions among individuals and their environment (eg., model of ant-trail and pheromone dynamics ), and why so many organisms have evolved these forms of motion that can potentially provide benefits to both individuals and groups as a whole [2-5].
Recently, our focus has been on the evolution of collective coordination motion; i.e., how the `forces’ of evolution that typically occur favor selfish individuals can result in swarming interactions that may benefit groups as a whole. To address such questions we combine computational models of swarming dynamics with principles of evolutionary theory (in particular, game theory) [2,3,4] as well as simple and elegant experimental set-ups .
 Christos C Ioannou, Vishwesha Guttal, Iain D Couzin, 2012, Predatory fish select for coordinated collective motion in virtual prey. Science. 337: 1212-1215 A video on YouTube.[PDF available from Iain Couzin's publications page. Look for publication #69.]
 Vishwesha Guttal*, Pawel Romanczuk*, Stephen J Simpson, Gregory A Sword, Iain D Couzin, 2011, Cannibalism as a driver of the evolution of phase polyphenism in locusts. Ecology Letters, Vol 15:1158-1166 [*co-first authors]. PDF (Free from journal website).
 Vishwesha Guttal, Iain D. Couzin, 2010, Social interactions, information use and the evolution of collective migration, Proceedings of the National Academy of Sciences, USA. 107:16172-16177. PDF. Also see: Movies 1 and 2.
 Debashish Chowdhury, Vishwesha Guttal, Katsuhiro Nishinari and Andreas Schadschneider, 2002, “A Cellular Automata model of flow in ant-trails: non-monotonic variation of speed with density”, Journal of Physics A: Mathematical and General: 35, L575-L577 (2002). PDF.