I took nikon lenses: 14-24, 24-70, 70-200. If I was only going to take one lens it would be the 24-70. If I was only going to take two lenses it would be the 24-70 and 70-200. The latter, zoom, is heavy but was very helpful as many of the birds are at a distance. The wide angle 14-24 allowed some interesting shots, but otherwise is not mandatory. If you rent a 300 mm lens I would leave the 70-200 at home. You will use the biggest telephoto you bring.