Tag Archives: FAQ

From bobble heads to eaglets: Natal down, thermal down, and flight feathers!

As the eaglets start to sprout feather cloaks, we’re getting questions about natal down, thermal down, and juvenile feathers. Unless otherwise stated, the information in this blog applies to altricial birds, although most research in this area has been done on precocial and semi-precocial birds like ducks, geese, and cranes. Altricial and precocial birds have some marked differences in pre-hatch follicular development and post-hatch molts.   Does thermal down sprout from natal down pores? Do flight feathers emerge from thermal down

Eaglet Growth and Development: Week Four

Three plumage stages are visible: natal down (head), thermal "down" (grey feathers), and juvenile plumage

We’re writing a series of blogs about the first few weeks of an eaglet’s life. An eaglet spends roughly 75 to 80 days in the nest. For about the first half, it grows and gains weight. For about the second half, it grows flight feathers and starts developing the skills it will need post-fledge. We will focus on week four in this blog. D32 and D33 are 26 and 23 days old. During week three (fourteen to twenty-one days), the

Eaglet Growth and Development: Week Three

April 21, 2019: D32

We’re writing a series of blogs about the first few weeks of an eaglet’s life. An eaglet spends roughly 75 to 80 days in the nest. For about the first half, it grows and gains weight. For about the second half, it grows flight feathers and starts developing the skills it will need post-fledge. We will focus on week three in this blog. D32 and D33 are 16 and 13 days old. During week two (seven to fourteen days), the

Your questions, answered: What’s in a name?

Your questions, answered: DM2 and DNF

What are we calling the eagles at our nests? In Decorah, the eagles are Mom and DM2 At Decorah North, the eagles are Mr. North and DNF Perhaps the number one question you’ve asked us this year touches on what we’re calling the eagles. Why aren’t we calling DM2 Dad, or Dad2, or Mr. Decorah, or anything else more name-like? Who came up with DNF – ugh, we hate that! Why not Mom and Dad, or Mr. and Mrs. North?

Eaglet Growth and Development, Week Two

April 11, 2019: Fish and more fish!

We’re writing a series of blogs about the first few weeks of an eaglet’s life. An eaglet spends roughly 75 to 80 days in the nest. For about the first half, it grows and gains weight. For about the second half, it grows flight feathers and starts developing the skills it will need post-fledge. We will focus on week two in this blog. In their second week of development, the eaglets will gain roughly two pounds between their 7th and

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