LyleLanley
Banned
When it comes to wildlife, the Tamron SP 150-600mm is great when it comes to price/quality. It's a little over a 1000$ and gives a lot of bang for your buck. Another possibility is the Nikkor AF-S 300mm f4. Same price, goes up to 300mm but it's a prime so it's gonna be sharp as hell. You could even use an extender for that one and still get good results. If you wanna go a bit more expensive you could try Nikkor AF-D 80-400mm F4.5-5.6 ED VR. Price range in the 2500$ region, but it obviously also gives you a great reach.
That Tamron is definitely an interesting option for the price.