Tag Archives: Eggs

February 18, 2024: A second egg for DNF!

February 18, 2024: DNF laid egg #2 today! We got a brief glimpse beyond the high walls of her grass berm - just enough to confirm egg #2!

DNF laid her second egg today at 2:49 PM nest time. When will her eggs begin hatching? I took a look at our records and saw an interesting variance between 2021 and 2022, although she laid her first and second eggs on the same day both years. In 2021, her first egg hatched on March 25 and her second egg hatched on March 27. In 2022, her first egg hatched on March 27 and her second egg hatched on March

DNF laid the first egg of 2024!

February 15, 2024: DNF lays her first egg of the 2024 season.

Congratulations to DNF and Mr. North! DNF laid her first egg of 2024 today at 2:12 PM CT. She tends to lay her eggs about 72 hours apart, give or take a little, so we’ll be watching for egg #2 on Sunday, February 18 at about 2:12 PM – although it could be a little earlier or a little later. As you watch the video, listen for her soft chirps and look for egg labor beginning at about three minutes.

When will it happen? Eggs, falcons, and ice-out in 2024!

March 18, 2022: DNF carefully rolls her eggs

When will the eagles lay eggs? When will falcons come back? Check out our quick and easy schedule below or read on to get the details! Want to help us log spring migrants on the Flyway? Share your sightings on our Facebook page, Instagram, or explore.org’s snapshot gallery. Please @raptorresource on Facebook and Instagram, and tag with #springmigration2024 on all platforms. You can also email photos and sightings to [email protected]. Remember to include the date! Female eagles tend to lay

Peek inside a bald eagle egg: 24 days!

Development of an avian embryo

There are two eagle eggs in Decorah trout hatchery nest N1. DH1 is about 27 days old and DH2 is about 25 days old. What do they look like? Let’s take a peek!  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 this animation uses a chicken

Egg Colors and Shapes

The Chicago Peregrine Program inspired me to write a quick blog on the colors and shapes of eggs. Bald eagles have white eggs, peregrine falcons have eggs that range from light cream through brick red, and red-tailed hawks have pale eggs that are lightly splotched with brown. How and why do the birds we watch lay differently-colored and shaped eggs? Egg Colors Where do egg colors come from? Once a bird’s egg enters its shell gland or uterus, it is

Peek inside a bald eagle egg: 11 days!

Chicken embryos roughly 25% of the way to hatch

What do embryonic 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 bald eagle eggs hatch in 35 days, the stages of development look something like this… What happens between the third and the 11th day? When we last touched on the topic, our embryonic eagle had

What Makes Bald Eagles Incubate?

February 21, 2022: North Nestoration Follies!

We wrote this blog a year ago. I wanted to revisit it given the events at the North nest this year. Mr. North and DNF have been dealing with intruders for a couple of weeks. Instead of perching near the nest, packing in food, and developing the reserves she needs to lay eggs, DNF is guarding her nest, egg, and mate from potential rivals. After egg number one, her testosterone and progesterone should rapidly decrease, while prolactin, a hormone that

Peek inside a bald eagle egg: 4 days!

An embryonic bird in very early stages of development. It has a top, bottom, front, back, left and right sides, and layers.

As of this writing, we’re still waiting for eggs at Fort St. Vrain. The first Decorah North egg is seven days old and the second is four days old. What do embryonic eagles look like as they grow and develop 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 bald eagle eggs hatch in 35 days, the

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