ABSTRACT INTRODUCTION Eric Snively. Department of Biological Sciences. CW 405, Biological Sciences Centre. University of Alberta. Edmonton, Alberta, T6G 2E9, Canada. eric.snively@ualberta.ca. Andrew Cox. 561 Woodland Drive. Radnor, PA, 19087, USA. andrew.cox@villanova.edu. Inference of behavior in extinct vertebrates often involves conflicting intuitions and PE Article Number: 11.1.3A Copyright: Palaeontological Association March 2008 Submission: 18 September 2007. Acceptance: 18 January 2008