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One of the 25 Yellowstone National Park bison allowed out of the Park and into Gallatin National Forest has been killed by Montana Department of Livestock officials after refusing to leave private property after two days of hazing.

A new stage in Yellowstone National Park bison management begins today, as the Interagency Bison Management Plan (IBMP) partner agencies are releasing up to 25 seronegative, monitored and tagged bison to be released onto the land between the northern boundary of Yellowstone National Park and Yankee Jim Canyon, at the northern end of the Gardiner Basin.

A female gray wolf from the Greater Yellowstone Ecosystem's Mill Creek Pack was poisoned in 2009 with a banned substance, Compound 1080, when she wandered into Colorado back in 2009, and the U.S. Fish and Wildlife Service is investigating.

A tally by wildlife biologists reveals a decline in the northern Greater Yellowstone Ecosystem elk population from 1995 to 2010, as increased predation, ongoing drought, and hunting all took their toll on the numbers -- and in the process caused a ripple effect that also took down the wolf and bear populations as well.

Visitation to Yellowstone National Park was down slightly in December 2010, as a decline in the number of visitors entering the Park via automobiles and snowmobiles was not offset by a rise in the number of snowcoach customers -- a trend continuing from last winter.

Seeking to determine how many bison can be supported in Yellowstone National Park, the National Park Service and Syracuse University Professor Douglas Frank are studying the effects of grazing on the Park's grasslands -- and perhaps countering some negative beliefs about how bison impact the ecosystem.

When Rick Buchanan asked about biking in Yellowstone National Park during the winter season, he was told to stay away: the only approved methods of transportation -- per the Winter Management Plan -- are guided snowmobiles, coaches and snowshoes. Should biking be considered in future plans?

In a move that doesn't surprise Yellowstone National Park observers grappling with climate change, the Endangered Species Coalition named the Greater Yellowstone Ecosystem as one of the 10 most endangered areas on the globe.

A year since a swarm of earthquakes hit an area right outside Yellowstone National Park, sensors have detected a series of small (under 1.7 on the Richter scale) micro earthquakes in roughly the same area over the last week. Is this just a burp, foretelling of another swarm, or more?

On a budget and wanting to see America's Oldest National Park? Check out the calendar of free days and weekends announced today by the National Park Service.