My world has an isolated valley between high mountains like the Himalayas that is practically cut off from the world by high elevation mountains and steep cliffs. The valley is about five miles in length and two miles in width. One river and various streams run through the valley. An isolated tribe of humans numbering about 100 to 150 live in the valley scattered in small villages of ten to fifteen. The humans have lived there for over 200 years. The humans take care to diversify their sources of food, and to not take more than they need. Their culture values preserving nature. The right side of the river is relatively uninhabited with forests that are left mostly undisturbed.
The humans domesticate a yak-like animal, herd goats, and hunt small game. They also may grow barley like the Tibetans if it proves there may not be many animals.
I think it is likely that the humans would have killed off the wolves or major predators, but would other animals be able to reproduce at a rate to maintain their populations if the human population hovers around 100?
The only animals that may be able to travel into the valley over the mountains would likely be birds or mountain goats.