Lily White
Clive Wilson
I too love nature photography, especially macro stuff. I was going to get a DSLR but realized that for hiking and nature strolls I really didn't want to be lugging a big camera and multiple lenses around. I ended up getting a Panasonic Lumix DMC LX5 and I am very happy with it. I need to learn a lot more about cameras before getting into a DSLR.
When I've been hiking around nature reserves or across downland I often see people with a whopping great dslr with a huge telescopic lens hung around their neck and a heavy rucksack full of equipment on their backs. They look so uncomfortable. My lumix isn't heavy and because I don't need all of the equipment I am in a position to climb through brambles or whatever if I see something or my usual trick on the downs is to slide down the slope because I've spotted a rare butterfly or something.
I think it depends on the wildife photography. If you are setting up around a wetland to photograph birds oon the water, then a dsr is fine, but where I do insect photography I actually walk miles and off the beaten track in search of butterfly colonies so lightweight is good.