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March 14, 2011: Second Egg in Nest

March 14, 2011: Second Egg in Nest

Credit: KGW

by Bob Sallinger

kgw.com

Posted on March 14, 2011 at 6:53 PM

Updated Thursday, Dec 5 at 1:33 PM

The Raptor Cam Red-tails laid their second egg today. It comes three days after the first egg which was laid on Friday. Red-tails typically lay their eggs 24-48 hours apart but there can be significant variation. In 2009 they laid three eggs with a 2-day and 4-day gap between eggs. In 2010 they laid three eggs with 3-day gaps between eggs. The hawks can lay up to four eggs so there may well be more on the way.

It will be interesting to see how the first egg fares---she did not incubate it last night during the storm. Eggs can withstand fairly extreme weather conditions before incubation begins. However, once incubation is initiated and the embryo begins to develop, they require very stable temperatures. Overheating is actually more of a threat than cooling to developing embryos. Limited cooling typically just slows embryo development whereas overheating even by just a few degrees can easily kill an embryo. The mom has not begun incubating in earnest yet so the egg should still be pretty tolerant of our weather conditions over the last couple of days.

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First visit to the nest this morning after a night of rain (c) Bob Sallinger

Lunch is served! (c) Krista Bradford

2 Eggs in nest (c) Krista Bradford

2 Eggs in nest close-up (c) KGW

 

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