I think we could suggest several very good lenses but no single lens that will do everything. There are lenses that have amazing focal lengths, like the Nikon 18-300mm, but they give you those at a price of image quality. I think the Nikon 18-105mm is one of the most versatile lenses out there but it's not what I'd want for real landscapes. For that I'd use my Tokina 11-16mm or the Tokina 12-24. There are Nikon equivalents, but those would be MY choices. If I was a serious birder, I want something in 300mm range.
All that being said, I think it's also important not to fall into the trap of asking yourself, "What lens do I need to get the shot I want?" and to start asking, "How do I get the shot I want with the lens I have?". The former path leads to NAS, the latter path leads to better photography.