Hayden Valley is a large, open valley known for its abundant wildlife viewing opportunities. The valley floor is covered in lush grasses and wetlands, providing ample food and habitat for a variety of animals including bison, elk, grizzly bears, wolves, coyotes, and bald eagles. We recommend starting your scenic drive early in the morning or late in the afternoon when the wildlife is the most active. Drive slowly down the road and stop at multiple designated parking locations to take in the views. Be prepared for bison crossing the roads and significantly adding time to your driving estimate. On the other hand, it presents a unique opportunity to take a closer look at these magnificent creatures. One of the major viewpoints in Hayden Valley is the Mary Mountain Trailhead, which provides a great vantage point for observing bison and other wildlife in their natural habitat. Another popular viewpoint is the Sulphur Caldron near the Mud Volcano. Hayden Valley is a unique and important ecosystem in the park, providing critical habitat for a variety of species. Its scenic beauty and abundant wildlife make it a must visit destination.