User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-2248808-20110826032448/@comment-1011548-20110826195148

If we assume 'Ancient' to mean it's a living fossil, it's survived over the eons because it's very good at filling its ecological niche. The real question is, if it lives in many of the same habitats as normal Rathian, does everything Rathian does but better, and is in the same place in the food chain as Rathian, why hasn't it out-competed normal Rathian to extinction?