[1] Zoological Museum,
[2] Universitetsparken 15,undefined
[3] 2100 Copenhagen Ø,undefined
[4] Denmark e-mail: kkampp@zmuc.ku.dk Fax: +45-35-321010,undefined
[5] Ornis Consult,undefined
[6] Vesterbrogade 140A,undefined
[7] 1620 Copenhagen V,undefined
[8] Denmark,undefined
[9] Institute of Population Biology,undefined
[10] Universitetsparken 15,undefined
[11] 2100 Copenhagen Ø,undefined
[12] Denmark,undefined