A bald eagle nest is constructed of interwoven sticks. The interior is lined with grass, corn stalks, and other material. The bowl is filled with soft materials such as moss (which may serve as an insect repellent) and the downy feathers from adults.

Predators who leave behind scraps of dead fish that they kill, such as brown bears (Ursus arctos), gray wolves (Canis lupus) and red foxes (Vulpes vulpes), may be habitually followed in order to scavenge the kills secondarily.

When food is abundant, an eagle can gorge itself by storing up to 1 kg (2.2 lb) of food in a pouch in the throat called a crop. Gorging allows the bird to fast for several days if food becomes unavailable.

It's a scene you've seen in countless movies: an eagle flies overhead and emits a rough, piercing scream. The only problem? Bald eagles don't make that sound. Instead, they emit a sort of high-pitched giggle. The sound is so uninspiring that Hollywood sound editors often dub over it with the piercing, earthy screams of a smaller bird--the red-tailed hawk.

Bald eagles have 3 eyelids! The outside two are the ones we usually see. On eagles the bottom eyelid is bigger than the top eyelid, so they blink up instead of down. They also have a transparent inner eyelid, called a nictitating membrane, which protects the eye and provides moisture.

Pesticides like DDT wreaked havoc on the bald eagle population. Chemicals collected in fish, which make up most of the eagle's diet. They weakened the bird's eggshells and severely limited their ability to reproduce. Since DDT use was heavily restricted in 1972, eagle numbers have rebounded significantly.