In reply to john_mx:
Do you mean the little fixed hunting/survey cameras (e.g.
http://bushnell.com/hunting/trail-cameras ), or a general use camera?
If the latter, worry less and spend less about the body than the lens. Even my old Canon 20D is ok for most wildlife work apart from birds in flight and low light. The lens is the critical component though and 400mm is really the shortest you can get away with, even in the garden (unless you're sat in a hide and very, very close). The super-zoom style compacts are generally very soft at the long end.
Some of my wildlife photography is at:
http://andyhphotos.com/Galleries/Wildlife/
Post edited at 10:58