There have been several cases of witchcraft in Nigeria (and other countries) where body parts of dead children have been thought to be a cure for Aids and other deadly diseases. And people have actually bought children from their parents in order to murder them and use them for this purpose.That is why I earlier stated that Ignorance must be tackled in order to combat these horrifyingly primitive and erroneous ideas and stop the trafficking of rhino horn etc. It's a complex social and political situation, with many serious causes to be addressed. Poverty and Ignorance are at the bottom of it all.