Fig. 2. Map showing risk assessment for avian influenza occurrence based on expert opinion and known species presence/absence (Harrison et al. 1997) of 16 southern African anatids. Note that the data for Botswana were recorded at half-degree (30x30) resolution in the southern African Bird Atlas, and that data for Mozambique (for completeness, shown here from south of the Zambezi) were not included in this analysis.