what lens do you use to shoot animals
I have been shooting with the Nikon 200-400mm f/4 VR lens for the last 4-5 years and I can assure you that the Nikon 300mm f/2.8G VR II is overall a better lens to buy (unless you shoot large animals from a close distance, like bears in Alaska).
1) Nikon 70-300mm f/4.5-5.6G VR. If you want to get into wildlife photography on a tight budget, the Nikon 70-300mm f/4.5-5.6G VR is the lens you want to get. It is a great buy that will get you to 300mm at under $600 USD. Its autofocus is pretty good in daylight and its versatile zoom range of 70-300mm is great for large animals and perched birds.