Global map of the predicted relative occurrence of avian influenza virus (AIV) in wild birds. The predictive model was constructed using the Random Forests algorithm on 41 predictor variables. The dots on the map represent all samples in both the testing and training databases. Locations where one or more AIV-positive samples were collected are shown as black dots; locations where no positive samples were collected are marked with white. A single dot may represent multiple samples taken at that location. This map is presented in Robinson (sphere) projection, central meridian 145°.