1. Aquatic Behavioural Ecology Laboratory, Department of Psychology, Neuroscience, & Behaviour, McMaster University, Hamilton, Ontario, Canada
2. Department of Neurobiology and Behavior, Cornell University, Ithaca, New York, USA
3. Department of Psychology, University of Washington, Seattle, Washington, USA
4. Department of Mathematics & Statistics, McMaster University, Hamilton, Ontario, Canada
5. Department of Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada