National parks are a great place to experience wildlife in their natural element, and to photograph them. But at times the plight of nature can generate pangs of helplessness, as nature photographer Deby Dixon realized in Yellowstone and Grand Teton national parks.

Wolves roaming Yellowstone National Park don't discriminate between park drainages, meadows, and woods and those features in the national forests rimming the park. They head where the scent takes them, and when they do, they sometimes find themselves in the gunsights of hunters. Such was the case recently for seven wolves whose lives came to an end in the forests outside Yellowstone.

Fish fry, anyone? That could have been the question at Yellowstone National Park this year, where crews removed more than 300,000 non-native lake trout from Yellowstone Lake in a bid to protect smaller endemic cutthroat trout.

Gates will be blocking access to most roads in Yellowstone National Park today, as the park is readying for the winter season by ending wheeled-vehicle access for the coming months.