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.

A long-awaited shift in Yellowstone National Park bison management is now in place. Bison roaming past Gardiner will be hazed and tested for exposure to brucellosis; those testing negative will be moved to the Gallatin National Forest, while the rest will be moved back to the Park. Critics say the new plan treats bison like cattle.

Exiled Yellowstone National Park bison stuck in quarantine for the past several years would get a little breathing room, as Montana officials propose temporarily moving YNP bison enclosed at Corwin Springs to three wildlife areas controlled by the state. But there's one big condition: they'd be hunted sometime down the line.

West Thumb Geyser Basin is one of the most unassuming thermal areas in Yellowstone National Park. It features no major attraction like Old Faithful or Morning Glory, nor is it particularly active. Containing no continually erupting geysers, West Thumb is mostly a collective of hot pools and springs, varying in size and shape.