Large carnivores living in tropical rainforests are under immense pressure from the rapid conversion of their habitat. In response, millions of dollars are spent on conserving these species. However, the cost-effectiveness of such investments is poorly understood and this is largely because the requisite population estimates are difficult to achieve at appropriate spatial scales for these secretive species.

Independent evaluations of the impact and legacy of large donor-funded integrated conservation and development projects (ICDPs) are critically important but rarely undertaken. The India Eco-Development Project around Periyar Tiger Reserve (PTR-IEDP) in southern India received US$ 6.0 million, of which 43.2% was spent on community-based conservation activities.