This is bird note.

That odd call that sounds like a rusty gate.

We're actually hearing a pair of bald eagles and they're getting ready to nest.

Bald eagles build large stick nests in tall trees, which they use year after year.

And these nests endure rough treatment.

Young eagles perch on the edge and flap their wings while holding on with

their feet to avoid premature departure. This upward tugging can pull apart sections of the nest.

The young birds may also yank it sticks with their beaks and chuck them over the side.

Weather and wind take their toll too.

So every year the eagles have to rebuild their bulky nests.

An eagle looking for material may fly at a dead branch that's still attached to a tree.

Coming in feet first, the bird hits the branch with its talons, and using

its forward momentum, breaks off the limb. The eagle then carries the branch, often up to five

feet long, back to the nest and wedges it in.

And here's something amazing.

Bald eagles have been known to carry sticks more than a mile to their nest. For Bird Note, I'm Michael Stein.

Bird Note is also available as a podcast.

Find out more when you visit our website,

Birdnote.org.

I'm Michael Stein. You're going to be.