Figure 3. Comparison of the average body size (pronotum width) of female and male O. babirussa  across populations from Malaysia (MY: Langkawi: n=318, Central Peninsular : n=97) and Singapore (SG: Pulau Ubin: n=121, CCNR: n=96) to determine the presence of sexual size dimorphism (SSD). SSD varied across populations (**=P <0.01, ***=P <0.001, ns=not significant).