Fort St. Vrain Eagles and Blogs

March 26: Nest news and Nestflix round-up!

March 26: Mom settles over the eggs

The Xcel Fort Saint Vrain eagles hatched their first egg last night at 9:43 PM MT! We start hatch watch in Decorah North on March 30th and hatch watch in Decorah on March 31st – although keep in mind that hatch could start a little earlier or a little later. We don’t know which egg broke in Decorah, so that could impact hatch timing as well. Once we have a pip, we’ll let everyone know! We’re also looking for an

Peek inside a bald eagle egg: 17 days!

A chicken embryo roughly halfway to hatch

This blog was first published on March 23, 2017. We reposted it to give everyone a peek inside the eggs. As of this writing, there are two eagle eggs in Decorah. We’re not sure whether the oldest or second oldest egg cracked, but we do know that the youngest is about 17.5 days 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

Can mice destroy bald eagle eggs?

03/13/19: A mouse under Mom Decorah's tail

Eeeek – mice! We’re getting asked whether mice could or did destroy eggs in our eagle nests. Our answer? A guarded “No”. In North America, researchers have found limited predation by mice in the nests of smaller birds, and none in the nests of birds of prey or larger birds. Researchers have been looking at nest predation for a long time. How do nest location, weather, landscape, habitat fragmentation, and predator-prey/predator-predator relationships impact predation rates? Can nest predation be reduced?

Your questions, answered: Questions from Explore followers!

A group of people look through binoculars

Since we weren’t able to get to everyone’s questions during our chat on Explore, we answered them here. Watch the full chat here! https://youtu.be/MCtdzn13aSI.  How do eagles keep their feet from freezing? An eagle’s legs use counter-current heat exchange to control body temperature. Warm arterial blood flowing from an eagle’s core into its feet passes cool venous blood flowing the other way. Heat is exchanged, warming the blood flowing into its core and cooling the blood flowing into its feet. The

Eggs and cold weather

04/18/18: Mrs. North incubates through the snowstorm

This blog was first published on Wednesday, February 26, 2014. It has been updated to reflect Mom’s new mate and includes some information about the Fort St. Vrain eagles as well. Everyone was worried about the eggs in Decorah back in 2014. Iowa was facing a polar vortex while Mom was laying and incubating eggs. While there have been other cold years, 2014 was one for the record books, with windchills of -50F when Mom laid egg #2. Given that 2019

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

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

A Reflection and a Thanksgiving

Thanksgiving 2018

November 23rd would have been Bob Anderson’s birthday. I assume that our friend and founder would finally have achieved his dream of retirement – or at least semi-retirement – and be busy with his book by now. Given the thankful nature of the season, it seems like a good time to take stock of where the Raptor Resource Project has been, where it plans on going, and what I have to be thankful for. For those of you who don’t

What’s on the Menu at Fort St. Vrain?

So what’s on the menu at Fort St. Vrain? While we were up in the nest, I decided to collect prey remains. We don’t have the necessary permits to take feathers (of which I found only two, both belonging to prey), but there were plenty of skulls and a few turtle shells. I got them home, laid them out on a table, and started ID’ing them. Some Moms bring home t-shirts and postcards. I bring home skulls and photos of

30-year Take of Bald and Golden Eagles

Wind Turbines

As a lot of eagle fans are aware, the Fish and Wildlife Service recently announced a plan that would allow companies to kill federally protected bald and golden eagles for up to 30 years. The draft rule will extend the current permit duration of five years to up to 30 years, giving wind farms, power lines and other large projects license to injure, disturb or kill a limited number of eagles in exchange for commitments to avoid and mitigate harm.

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