Yellowstone is the center of an ecosystem-scale wildlife tapestry with threads that stretch all across parts of the western hemisphere. Each season, birds and mammals pulse in and out of Yellowstone’s critical wildlife habitat in an annual cycle of movement that is as old as the land itself. In the largest intact ecosystem in the lower 48 states, the wildlife show is second to none. No matter when you visit the park, you’ll get a front-row seat. Here's what's happening in January: Most of the pa

A winter Sawmill Geyser eruption in Yellowstone