A need for continued collecting of avian voucher specimens in Africa: why blood is not enough

John M Bates1, Rauri CK Bowie2*, David E Willard1, Gary Voelker3 and Charles Kahindo4 1 Zoology Department, Field Museum of Natural History, 1400 South Lake Shore Drive, Chicago, IL 60605-2496, United States of America 2 Department of Zoology, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa 3 Department of Biology, University of Memphis, 3700 Walker Avenue, Memphis, TN 38152, United States of America 4 Institute of Environment and Natural Resources, Makerere University, PO Box 7062/7298, Kampala, Uganda * Corresponding author, e-mail: bowie@sun.ac.za