Stephanie Tyler from BirdLife Botswana provided July counts for 2013.
Holger Kolberg from the Ministry of Environment and Tourism provided counts from February - August 2013.
Leif Nilsson from the University of Lund provided January counts and Goose counts for the 2012/2013 season.
Verena Keller from the Swiss Ornithological Institute (Vogelwarte) provided January counts from 1967 - 2013.
P.O. Box 471
6700 AL Wageningen
Tel. +31 (0) 318 660 910
Chamber of Commerce Reg. no.: 9099028
RSIN Number: 806703726