Tag Archives: FSV Eagles

Do bald eagles delay incubation?

February 14, 2019: FSV

This blog was first published on Tuesday, March 29, 2016. It has been updated to reflect new knowledge and events. Do bald eagles delay incubation? It wasn’t an a question we’ve thought about much, since bald eagles in Iowa usually lay eggs in temperatures under – sometimes well under – freezing! However, 2016 was quite a bit warmer, and the eagles in Decorah and Fort St. Vrain seemed to spend more time off the first two eggs than we are used

February 13, 2019: 1st egg for the FSV eagles!

Congratulations to Xcel Energy’s Fort St. Vrain eagles on their first egg of the year! It arrived at 8:40PM MT on February 13th – a perfect Valentines Day treat for all of us today! This video by Elfruler shows the entire event: https://youtu.be/koO15X2PDMU. I love the new egg and the ducks in the background. This seems like a good time to revisit the whole subject of incubation: https://raptorresource.blogspot.com/2016/03/do-bald-eagles-delay-incubation.html. This blog was first published on Tuesday, March 16.

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

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

We’ve talked about how long it takes bald eagle eggs to hatch after they are laid (an average of 38 days from first egg to first hatch in Decorah), how long hatch takes once pip starts (it can take upwards of 24 hours), and how long it takes Mom to lay each egg (she usually lays the second egg about two to three days after the first, and the third egg roughly four days after the second egg). But how

Friday Nestflix!

February 7, 2019: Mom at N2B

Happy Fri-yay, everyone! Grab the popcorn and look for great close-ups, two food fights, and very cool fly-ins and vocalizations in Decorah, and a pellet casting and nestorations at our Fort St. Vrain nest. thanks to our excellent crew of camera operators and video makers for finding and sharing special moments in the nest with us! Looking for something to do besides watching eagles? We’ve added a prey log feature to our website. To submit your prey observations, go to

What is a Brood Patch?

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

This flashback blog was originally published on February 16 of 2017. Since we’re looking forward to eggs at all of our nests, it seems like a good time to discuss the brood patch – a result of the many hormonal changes that our eagles are experiencing as they come closer to laying eggs.  Press the arrows to view both of the eagles. Robin Brumm and Debbie Fulton got great captures of brood patches from the North Nest (Mrs. North, 2018)

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