You don't have to worry about the birds attacking you; they're pretty harmless. If you were near their nest, that's another story. But even then, they're not going to eat you! They would only eat you after you were hit by a car!
If the skunk died or was killed quickly it may not have sprayed its scent. Or you may have been upwind.
Your options would be a 300mm F/4 AF-S with a 1.4 or 2X teleconverter or one of Nikon's big lenses: 200-400mm zoom, 500mm, 600mm. The latter are pretty big to hand hold without camera motion blur, and they're heavy and cost $$$. You would need to use a tripod with them for best results.