What Happens When a Bald Eagle Loses a Feather?

A bald eagle can achieve a flight speed of up to 100 miles per hour (161 km/hr) when diving for prey, maneuvering a pair of wings that can span as much as eight feet (2.4 m). These majestic birds, adopted as the national symbol of the United States in 1782, depend on aerodynamic balance -- so much so that if a bald eagle loses a feather on one wing, it will also shed the corresponding feather on the other wing.

In the wild, bald eagles usually live between 30 and 35 years, feeding primarily on fish, small mammals, waterfowl, and carrion.

The bald eagle, high and mighty:

• Eagles have excellent eyesight. They can see up to seven times farther than humans, which allows them to hunt successfully from great heights.
• Bald eagles are masterful nest builders. The largest known nest was found in Florida: It was 9 feet (2.7 m) across, 20 feet (6.1 m) deep and weighed more than 2 tons.
• Bald eagles mate for life and share parental duties. A female usually lays two or three eggs at a time, but both parents guard against predators, which can include squirrels, gulls, and ravens.

Frequently Asked Questions

What is the process called when a bald eagle loses its feathers?

The process of losing feathers in bald eagles, and birds in general, is known as molting. Molting is a natural, cyclical process that allows birds to replace old or damaged feathers with new ones. This ensures that their plumage remains in optimal condition for insulation, flight, and waterproofing.

How often do bald eagles molt their feathers?

Bald eagles undergo molting annually, although the process is gradual and not all feathers are replaced at once. Instead, they lose and regrow feathers in a balanced manner to maintain flight capability. The molting process can span several months and is typically completed before the breeding season.

Do bald eagles experience any discomfort during molting?

While there is no direct evidence to suggest that bald eagles experience discomfort during molting, it is a demanding process that can affect their energy levels. The growth of new feathers requires significant nutritional resources, and eagles may appear less active during this time as they conserve energy.

What happens if a bald eagle loses a primary feather?

If a bald eagle loses a primary feather, it will usually grow a replacement feather through the molting process. To maintain balance, the corresponding feather on the opposite wing may also be shed. This symmetry is crucial for efficient flight and maneuverability, ensuring the eagle remains aerodynamically stable.

Can a bald eagle still fly if it loses feathers?

Yes, a bald eagle can still fly if it loses feathers, as molting occurs gradually and symmetrically, allowing the bird to retain its flight capabilities. However, if an eagle loses too many feathers at once due to an injury, it may struggle with flight until enough feathers have regrown.

Is human intervention necessary if a bald eagle is found with missing feathers?

Human intervention is generally not necessary for a bald eagle with missing feathers due to natural molting. However, if the bird has sustained injuries or abnormal feather loss, wildlife rehabilitators may step in to provide care and ensure the eagle can safely return to the wild once it has recovered.