Tag Archives: FAQ

Peek inside a bald eagle egg: 4 days!

An embryonic bird at 33 hours

As of this writing, the last Decorah egg is 22 hours old, the last Decorah North egg is 9 days, 23 hours old, and the last Fort St. Vrain egg is 12 days, 22 hours old. What do embyronic eagles look they look like as they develop and grow inside their eggs? Dr. Peter Sharpe from the Institute for Wildlife Studies developed a table of bald eagle embryonic development based on work done by Hamburger and Hamilton (1951). While not all

Sweet Eagle Dreams!

February 19, 2020: DNF slumbers on the nest

This blog on eagle sleep was first published in 2017. I thought about it after watching Mr. North and DNF slumbering on their perches last night. Both eagles appeared to be sleeping very deeply. Were they dreaming? Do Bald Eagles Dream? Do bald eagles dream? Some footage of Mrs. North¬†(Amy’s note: the first Decorah North female) got us discussing it. In the video, Mrs. North appears deeply asleep, with her head tucked underneath her wing. At eleven seconds, she starts

Courtship, copulation, and other things romantic!

February 5, 2020: Body brushing - Mom and DM2 stand wing to wing in the nest

This is a traditional Valentines Day post for us, but we decided not to wait this year…just in case one of our eagle pairs lays eggs early! Bald eagle courtship Bald eagles are famous for their whirling nuptial flight, but eagle courtship includes any activities that establish a new pair bond or renew an existing one. At our Decorah, Decorah North, and Fort St. Vrain nests, courtship usually begins in early October. Bonded pairs start working on their nests by

How long does it take a bald eagle to lay an egg?

An egg in cross section, modified from Romanoff and Romanoff, 1949

How long does it take a bald eagle to lay an egg? We think that female bald eagles begin laying eggs five to ten days after productive mating begins. In 2018 and 2019, Mom laid her first egg about eleven days after copulation went from casual to frequent…and very determined on Mom’s part.¬† We’ve often seen female eagles take the lead – beak-biting and footing their mates, loudly vocalizing their intentions, and mounting them! You don’t need to be a

Why do bald eagles lay eggs in ice and snow?

Egg-laying Map

Why do the Decorah and Decorah North eagles lay eggs in ice and snow? A lot of you – especially those of you who also watch the Florida eagles – are curious about bald eagle egg timing. Wouldn’t it be better to delay egg-laying until mid-March or early April? We’ll unpack the question by starting with a few facts. An Overview of Bald Eagle Nesting Bald eagles don’t all nest at the same time. In the southeastern United States, especially

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