Fort St. Vrain Eagles and Blogs

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

How do eagles stay warm in cold weather?

January 14, 2021: Eagles at Lock and Dam Seven on Lake Onalaska, Mississippi River

Iowa bald eagles nest in extremely cold weather. How do they stay warm?  Bald eagles maximize energy gain by foraging in groups, gorging food, and increasing the assimilation of ingested food energy. They minimize energy loss by reducing activity, seeking protective microclimates, and lowering their nocturnal body temperature. In short, eagles keep warm by using the least amount of energy to get the most amount of food. Group Foraging and Changes in Behavior All bald eagles reduce activity and seek shelter during

Where are eagles D27 and D36?

Wolf Creek Falls in Banning State Park. Photo by Robert Johnson.

Where are eagles D27 and D36? I’m delighted to report that we got postcards from both of them earlier this week! As you might recall, D27 left for Canada on July 16 – about the time that we were thinking she might be looking for a place to settle down! She’s tended to migrate north between mid-to-late May and early June, although she’s drifted later as she’s aged. Still, her mid-July departure caught us by surprise! Whatever the reason –

Update from Fort St. Vrain

The Xcel Energy Fort St. Vrain nest with little FSV44 sitting tall in a well-stocked pan-tree!

– By Lisa Levesque and Elaine Burritt Good morning everybirdie. FSV44 is 12 weeks old today. I wanted to do a small recap of this crazy, sad, happy, exciting, and educating season. In August 2020 Bill Heston reported that the nest had collapsed. John Howe, Bill, Tina Lopez, and Tina’s husband worked to rebuild this beautiful nest. At the end of January the pair showed up, there were great behavioral differences. It was realized we had a new Pa. It

Loss of an eaglet at Xcel Energy’s Fort St. Vrain Site

April 15, 2021: Ma, Pa Jr, and FSV43

We are sorry to announce that FSV43 – the newest eaglet at Xcel Energy’s Fort St. Vrain site – died sometime during brooding yesterday. Both parents brooded faithfully and the eaglet appeared to be healthy and eating well earlier in the day. The second egg appears to be pipping and may hatch tonight or early tomorrow morning. I really enjoyed this site and feel bad for Ma and Pa Jr., who both worked so hard to care for their eggs

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