Some organizations that offer at least small grants that I think could be used in Africa are: http://www.foc-uk.com/ http://www.bou.org.uk/bouresg.htm
As important as funding issues in working in Africa are logistical and cultural ones. Africa has perhaps the lowest African scientist to western scientist ratio in the world. This limits opportunities for collaboration with nationals, and also creates the problem of recapitulating colonialism through science. I know of major, long-term wildlife studies that do not incorporate any African's except as camp guards. Conservation, wildlife management, agriculture, and sustainability will not go far if locals are not invested in the research. There is an African Academy of Science and also numerous journals published in Nigeria, Ghana, Kenya, and South Africa.
