>>4099644first things first borrow or rent some camera kit so you know what you're getting into. for wildlife and nature photography lens selection is difficult. wildlife and nature can require a 3 lens set of a wide to normal zoom, a macro lens, and a supertelephoto depending on what you're taking pictures of and how good you are at sneaking up on pumas. when you borrow a camera you will realize how little reach a large and expensive 200mm lens has for some animals and how useful the f2.8 part that makes it larger and more expensive is for getting quality photos out in the woods.
people with no intention of taking photos of birds or "shooting" dangerous game do fine with a wide to normal zoom or a pair of primes for almost everything and a 100mm macro lens for bugs and plants and the short telephoto range. you can also strap the camera to a drone or set it up with a camera trap and flashes all on well-anchored stands. a lot of award winning shots were made with that technique, no need for telescopes of lenses. being creative with flash is really your friend for macro and camera trap photography.
generic camera buying guidelines
>megapixel needs are determined by your printing/cropping intentions, bigger isn't always better, you probably don't need the newest $4000 camera>the dimmer or more difficult the light you intend to shoot in unaided, the bigger your camera sensor should be to get enough dynamic range and the least noise. fair weather daytime photographers can get away with cheap and light micro four thirds systems.>the dimmer the light the faster the lens (lower F number) you will need to get the most image quality out of your camera 