Acknowledgments

This research was funded by PhD studentships from the Natural Environment Research Council (UK) to KTB (NER/S/A/2006/14101) and PLF (NER/S/A/2006/14033), with additional funding to KTB from the Jurassic Foundation and the Palaeontological Association Sylvester-Bradley Award. The Museum of the Rockies and the Bureau of Land Management are thanked for their help excavating and casting Big Al. The authors thank the editors, particularly Mark Purnell, and two anonymous reviewers for their comments, which greatly improved the final manuscript.