They didn't give any reason at all - but FWIW, they didn't actually ban Leopard hunting, they just restricted the permists to about 20 or so for the whole country. - Many of those 20 were issued to areas with very few Leopards!
I've always believed that there was no deliberate intention in Botawana to ban or restrict hunting per se, but now I'm not so sure. - They also withdrew all PAC Elephant permits in the tribal areas for 2009. Admittedly, this was largely due to some idiot overpricing the 2008 permits, so very few got shot in those areas last year.......... but when all 3 actions are combined, it doesn't bode too well for the future.
What will happen in areas such as the Delta remains to be seen and as I don't have a crystal ball, I guess all I can say is that time will tell.......