1. Nigel J. Collar, BirdLife International, David Attenborough Building, Cambridge CB2 3QZ, UK; and Bird Group, Natural History Museum, Akeman Street, Tring, Herts. HP23 6AP, UK.
2. Jaber Yahia, Faculty of Science, Omar Al-Mukhtar University, El-Bayda, Libya; and Nature Wildlife Resources Environment Society (NWRES), Libya.
3. Nicola Baccetti, ISPRA, via Ca' Fornacetta 9, I-40064 Ozzano Emilia (Bologna), Italy.
4. Alex J. Berryman, BirdLife International, David Attenborough Building, Cambridge CB2 3QZ, UK, e-mail: