Tag Archives: FAQ

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? In general, female birds inherit egg colors and patterns from their female parents. Egg-shell is made primarily of calcium carbonate,

Your Questions, Answered: New eagles appear on N2B!

Your questions, answered: new eagles in Decorah?

How old are the eagles we saw at N2B this morning? Is the female old enough to lay eggs? Will Mom and DM2 object? We’ve left the Confusion Couch for the Decorah Tilt-A-Whirl, but we’ll answer your questions as best as we can!  How old are the eagles we saw at N2B this morning? The male eagle is over five years old, although we aren’t sure how old he is. Eagles complete their transition to adult colors (white head and

Peek inside a bald eagle egg: 11 days!

Chicken embryos roughly 25% of the way to hatch

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 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 inner

Eagles, ‘menopause’, and a new mate at Xcel Energy’s Fort St. Vrain plant

Avian Reproductive System, From Handbook of Bird Biology, Second Edition

Has Ma FSV entered ‘menopause’? This blog was going to be focused on eagles and ova, but Elfruler, our original DE lead mod and a long-time chronicler of bald eagle nests, noticed that the male had a band on his right leg, not his left. A new eagle has replaced Pa FSV. If you’d like to learn more about eagles and ova, please read on (TLDR: Ma FSV has not entered menopause). Thanks to Elfruler for her observations and Donna

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