Figure 1

Map of the study sites in the Udzungwa Mountains.
Tanzania (a), enlargement indicating the two selected forest blocks, Mwanihana and Magombera (b), sample sites for the seven groups of Udzungwa red colobus (c). Dashed line in (b) denotes the border of the Udzungwa Mountain National Park. Symbols identify forests (i.e. triangles and circles for Mwanihana and Magombera respectively), while colours identify each social group. Figure (a) is based on OCHA map and edited with Inkscape (www.inkscape.org); Figure (b) was generated with Inkscape; Figure (c) was generated with R (www.r-project.org) with the ggmap library and edited with Inkscape.