I recommend you look at the Fuji system. If you want to photograph wild animals from a greater distance, you need the fastest possible long telephoto lenses. In the Nikon SLR class, for example, as well as with the other big brands, these lenses quickly become very expensive. With Fuji you have the great advantage, especially for learning, that with the X-T series of cameras X-T 1, X-T 2, X-T 3 and X-T 4 all relevant and important controls are located on the outside of the camera body. This means that you can always check what you have just set up with one look at the camera. For beginners (but also for professionals) this is very helpful. If you have a smaller budget, you can also look at the smaller X-T 20 or X-T 30 models. The entry-level telephoto zooms like the XF 55-200, for example, will give you a lot of performance for relatively little money when photographing animals. Best regards, Kubi