1. School of Biological Sciences University of Aberdeen, King's College Aberdeen AB24 3FX U.K.
2. Department of Animal Sciences Purdue University West Lafayette IN 47907 U.S.A.
3. Centre for Research in Animal Behaviour, School of Psychology University of Exeter Stocker Road Exeter EX4 4PY U.K.
4. Department of Biology Algoma University 1520 Queen Street East Sault Ste. Marie ON P6A 2G4 Canada
5. Department of Biological Sciences University of Cincinnati 318 College Drive Cincinnati OH 45221 U.S.A.
6. Département des Sciences Biologiques Université du Québec à Montréal 141 Avenue Président‐Kennedy Montréal QC H2X 3X8 Canada
7. Department of Biosciences Rice University 6100 Main Street Houston TX 77005‐1827 U.S.A.
8. Maelstrom Research, The Research Institute of the McGill University Health Centre, Montreal General Hospital 1650 Cedar Avenue Montréal QC H3G 1A4 Canada