PREDATORS -- It looks as though someone has killed another wolf with food.

A ranger at Yellowstone National Park has killed a gray wolf that repeatedly had come close to people in recent months.

The first case of this sort occurred in 2009, when park officials carried out their new management plan to eliminate any wolf that showed aggressive behavior or even too much friendliness toward people.

Park spokesman Dan Hottle says the 110-pound male wolf had come within a few feet of visitors and park staff on several occasions since this summer. Efforts to haze the wolf away from populated areas had proved unsuccessful.

Hottle says a ranger killed the wolf with a rifle on Saturday. The wolf was estimated to be between two and four years old and Hottle says park staff were concerned it might demonstrate more aggressive behavior.

Hottle says the park staff never saw anyone feed the wolf but believed it was conditioned to human food because it was following people. Feeding animals is a violation of park regulations.