In a really neat set of experiments conducted with Steve Simpson (University of Sydney) and Iain Couzin (Princeton), we demonstrated that Mormon crickets in migratory bands move for two reasons: 1) to exploit new nutritional resources, namely protein and salt, and 2) to avoid being eaten by hungry conspecifics approaching from the rear (Simpson et al. However, once these groups form, individuals in the group must contend with increased competition for resources as well as the threat cannibalism. We also performed a key manipulative experiment with Mormon crickets demonstrating for the first time that migratory bands function as part of an anti-predator strategy (Sword et al., 2005).
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