Make no mistake about it. Wildlife photography is a gear heavy endeavor. You have to be not only at the top of your game as a photographer, but also carry top quality equipment to make your efforts worth the while. You need a good quality DSLR capable of shooting in low light, and if possible something that is ISO invariant. You need a tripod, or a monopod or at least a bean bag that will give you extra support to stabilize your lenses when shooting in tight places. But above and beyond everything else you need top quality glass. This is something that cannot be compromised with. Even if you cannot...