The river from the base of Glen Canyon Dam to Lees Ferry attracts many colorful neotropical migrants such as blue grosbeaks, Bullock's orioles, and yellow-breasted chats. In the winter, waterfowl of all types flock to both the lake and the river. Lees Ferry is an excellent place to observe large concentrations of many species of ducks. Winter is also a wonderful time to observe bald and golden eagles, the two largest birds of prey found in Glen Canyon. They can sometimes be seen diving at the bald eagles, who only visit for the winter fishing.
Vegetation varies in different areas or plant communities.
Altitude and temperature partially define these communities, but soil and moisture are key determinants. In an environment that receives little more than eight inches of precipitation annually, the slightest variation in the amount of available water can drastically alter plant life. Many miles of streamside and canyon bottoms provide the habitat for this community. Although some streams are usually dry in the spring, water is generally available deep below the surface. Plants growing here have to be adaptable and must be able to also tolerate occasional severe flooding.