Given the importance and wide distribution of Influenza A viruses, it is surprising how little is known about infections of wild mammals. A new study led by Alex D. Greenwood and Gábor Á. Czirják of the Leibniz Institute for Zoo and Wildlife Research (Leibniz-IZW) in Berlin sheds light on which species are commonly infected and why. The scientists detected virus exposure among wild African mammals in Namibia and demonstrated that the most important factor for influenza A virus diversity and prevalence is a diet containing birds. Species relationship or sociality play surprisingly small roles. The results have been published in The Journal of Infectious Diseases.