Tag Archives: Eggs

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

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

This blog was first posted on Thursday, February 22, 2018. While it was written about Mom and Dad Decorah, it applies to all of the eagles we watch. 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

Will Mom and DNF lay eggs?

An image of eggs

Will Mom and DNF lay eggs? When will they lay eggs? Will those eggs be fertile? A lot of watchers have egglets and eaglets on their minds! The short answers: We believe that Mom Decorah and DNF (the Decorah North Female) will lay eggs based on what we’re seeing at their nests. They are both bonded with mates who are meeting their physical and psychological needs, including meal-sharing, mutual nestwork, nest bowl preparation, territorial defense, courtship, and copulation. While we worry,

Nest chronology: Egg timing!

Second egg for the Decorah Eagles!

This  blog was originally published on Tuesday, March 20, 2018, to answer questions about egg-timing. It discusses the correlation between new mates, temperature, humidity, and egg-timing.  We’ve been getting questions about egg timing. Why did Mom and Dad lay eggs later in 2018? Overall, avian egg-timing in the temperate zone is heavily regulated by the light cycle. As the days begin to lengthen, birds’ gonads swell and produce sex hormones. Around the end of January, our bald eagle pairs switch from

When will our eagles lay eggs? Bald eagle breeding in Iowa and Florida

Daylight Length Graph from Fort Meyers Florida

When will the Decorah and Decorah North eagles begin laying eggs? While nest timing can very from region to region (Florida, for example, is quite different from Iowa), mark your calendars as follows! In the nests we watch in Iowa and Colorado, bonding and copulating behaviors become more pronounced and frequent after the winter solstice. Female eagles begin laying eggs 5-10 days after productive copulation begins. This usually happens in mid-February at the Decorah and Fort St. Vrain nests. In

Will Mom Lay Eggs? When Will Mom Lay Eggs? Your Questions, Answered!

Decorah Mom and the first egg of 2017

We’re getting a lot of questions about Mom Decorah and eggs. When will she lay eggs? Will she lay three eggs again? We don’t want to count Mom’s eggs before she lays them, but we have some answers (and some speculation) to your questions! Will a new mate equal later eggs? Let’s start by taking a look at Mom’s egg laying history… As the table above shows, Mom’s first egg (that we have a date for, since she laid eggs

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