Bald eagles are found in Yellowstone throughout the year. You are however, more likely to spot them in the winter. This female was guarding her nest even though in late February she had yet to lay any eggs. This nest, located just inside the West Yellowstone entrance is probably the most famous bald eagle nest in Yellowstone. Bald eagles build their nests in large trees near rivers or coasts. A typical nest is around 5 feet in diameter and can weigh as much as 2 tons.
The plumage of an adult Bald Eagle is evenly brown with a white head and tail. The plumage of the immature is brown, speckled with white until the fifth (rarely fourth, very rarely third) year, when it reaches sexual maturity.