As most of my games are skirmish of all sizes with a bit of role play thrown in, I do like to keep the lads on their toes and was wondering the same thing myself. I've got a copy of Mammalian Mayhem and a long time ago there was a set of rules in Wargames illustrated by Howard Whitehouse, I think titled "The Lion Eats Tonight". Again a dedicated Big Game Hunt but very entertaining. Still haven't found a system that works easily for Random encounters and suchlike. So if anybody out there... I'd be mighty grateful
Cheers Johnny