SLR vs MF for wildlife is an interesting topic; but several factors
1. How big!
(Ahmm; fox vs cardinal?)
2. Portable?
3. Final print size
I have experimented with:
Leica Modular (up to 1600mm) with DMR, P65+ (with sliding back) and even M8!
Contax 350mm and 1.4x with P25 to P65+
Leica 400/6.8 with DMR, Viso-M8 and Pentax K-7
Schneider 300/2 with Hassey adapter and Contax
350mm SA Zeiss with P65+
The most satisfyng yields overall?
fixed; 350mm SA (or Contax) with P65+ unbelievable detail on a tripod with Better beamer flash!
mobile 400mm/6.8 and DMR (though recent experments with K-7.. really neat! stabilized 400mm)
its fun, but Doug just proves one thing; we are ALL focusing on the wrong thing-equipment.
HE can get close enough to tickle their tailfeathers while we are lucky to get into the same county!
Victor