1. T. Arndt, Brueckenfeldstr. 28, 75015 Bretten, Germany, e-mail: thoarndt@aol.com.
2. N. J. Collar, BirdLife International, Pembroke Street, Cambridge CB2 3QZ, UK, and Bird Group, Department of Life Sciences, Natural History Museum, Tring, Herts. HP23 6AP, UK.
3. M. Wink, Institute of Pharmacy and Molecular Biotechnology, Heidelberg University, Heidelberg, Germany