Bald Eagle D27 Found Dead

We’re sorry to announce that Bald Eagle D27 was found dead near Castalia, Iowa earlier this year. She was the daughter of Mom and Dad
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What is a brood patch?

Daylight length, or photoperiod, strongly influences hormone production in birds. In the northern hemisphere, our story begins shortly after the winter solstice in December. As
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Eaglet Growth and Development, Week Two

In their second week of development, eaglets gain roughly two pounds, experience rapid growth in features like beaks, culmens, and footpads, start replacing their white natal down with thicker grey thermal down…
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How Do You Tell HD and HM2 Apart?

We’re getting questions about how to tell HD and HM2 apart. ID can be pretty tricky, but here are a few pointers. When the two
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Monday NetFlix Mega Raptor Roll: Eaglets and Eggs!

We have your Monday mega-raptor roll Nestflix! But before we get to the movies… Decorah Eagles DH3 and DH4 are in their second week of
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More News

Bald Eagle D27 Found Dead

April 13, 2026

We’re sorry to announce that Bald Eagle D27 was found dead near Castalia, Iowa earlier this year. She

March 30, 2018: Mrs. North's brood patch

What is a brood patch?

April 11, 2026

Daylight length, or photoperiod, strongly influences hormone production in birds. In the northern hemisphere, our story begins shortly

April 23, 2025: What a solid little chunk - and see those growing clown clompers?

Eaglet Growth and Development, Week Two

April 8, 2026

In their second week of development, eaglets gain roughly two pounds, experience rapid growth in features like beaks, culmens, and footpads, start replacing their white natal down with thicker grey thermal down…

March 30, 2026: HD visits the nest, but HM2 isn't interested in giving up her spot.

How Do You Tell HD and HM2 Apart?

April 7, 2026

We’re getting questions about how to tell HD and HM2 apart. ID can be pretty tricky, but here

Established in 1988, the non-profit Raptor Resource Project specializes in the preservation of falcons, eagles, ospreys, hawks, and owls. We create, improve, and directly maintain over 40 nests and nest sites, provide training in nest site creation and management, and develop innovations in nest site management and viewing that bring people closer to the natural world. Our mission is to preserve and strengthen raptor populations, expand participation in raptor preservation, and help foster the next generation of preservationists.