Tag Archives: Eggs

Nest chronology: Egg timing!

Second egg for the Decorah Eagles!

This blog 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 infrequent copulation to frequent, highly enthusiastic copulation, putting us on notice for egg

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

Loss of the North Egg

03/16/18: Lone egg at Decorah North fails

Written by Sherri Elliott Dear Friends, We are deeply saddened to report that the one egg at Decorah North Nest laid on February 25th was lost on Friday in the early morning hours. Mrs North had gotten up for a change of position and the egg was already stuck to her chest, indicating that it had been crushed or collapsed, and the contents were oozing out. Clearly, there was something wrong with the shell, but we are uncertain yet at

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