1. John-James Wilson, Vertebrate Zoology at World Museum, National Museums Liverpool, William Brown Street, Liverpool L3 8EN, UK, e-mail: .
2. Clemency Fisher, Vertebrate Zoology at World Museum, National Museums Liverpool, William Brown Street, Liverpool L3 8EN, UK, & Bird Group, Natural History Museum, Tring, Herts. HP23 6AP, UK, e-mail: .
3. Tereza Senfeld, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen AB25 2ZD, UK, e-mail: .
4. J. Martin Collinson, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen AB25 2ZD, UK, e-mail: