Proponents argue that, by involving local people in accommodating tourists and acting as guides, ecotourism aids development. In Uganda, for example, hundreds of locals supplement their income by working as rangers or field staff in the Bwindi Impenetrable Forest. In many cases, local communities work as partners with ecotourism organizations rather than just as participants. However, ecotourism can also limit development prospects for local communities. Jim Butcher of Canterbury Christ Church University in England believes that ecotourism's focus on preserving "nature" damages local people's ability to develop sustainably and lift themselves out of poverty. The environment is effectively prioritized above the needs of local people.