Sir David Attenborough (OM, CH, CVO, CBE, FRS, FZS, FSA) of course!

nw) Stephen Fry is a genius as well, but I've never seen him doing any wildlife presenting so I can't judge him on his capabilities in that field. Even though, I find it nearly impossible to imagine his nature presenting skills would equal or even approach that of Sir David Attenborough (OM, CH, CVO, CBE, FRS, FZS, FSA).