[Tweeters] Request for information on local WA Bald Eagle incubation dates

Kelly McAllister mcallisters4 at comcast.net
Sun Mar 6 16:47:47 PST 2016

Well, it’s now March 6th so we’re getting dangerously close to the normal time period for appearance of eggs in Bald Eagle nests in western Washington. However, I did see an adult hunkered down in incubation posture in the nest at Mud Bay, south of US 101 west of Olympia, today. I remember that Charlie Nash, the postmaster of Friday Harbor who had a keen interest in the nesting Bald Eagles in the San Juan Islands, once wrote down his sighting of an egg in a nest (viewed from an airplane) on March 9th. That was, for me, the early date that I carried around in my head for a long time. It’s funny, because I forget so many things, that I still remember that tiny factoid.

Kelly McAllister

From: tweeters-bounces at mailman1.u.washington.edu [mailto:tweeters-bounces at mailman1.u.washington.edu] On Behalf Of Bud Anderson
Sent: Sunday, February 28, 2016 5:44 AM
To: tweeters <tweeters at u.washington.edu>
Subject: [Tweeters] Request for information on local WA Bald Eagle incubation dates

Last Friday, 26 February, we found an adult Bald Eagle already incubating in a nest near Everett.

This seems quite early to me and I was wondering if anyone else out there is seeing this behavior right now in your local nest(s).

If you live from Seattle north and know of any currently active eagle nests, I would be grateful to learn what you are seeing.

Although I am told by Martin Muller that Bald Eagles can engage in false incubation for several days prior to egg- laying, I am defining incubation for this survey as being an adult lying down horizontally in the nest for an extended time period, let's say 15 minutes or more.

We know that climate change is advancing breeding activity dates in many species of birds.

I am curious if this might include Bald Eagles in our area too.

Perhaps someone is already looking at this?

In the meantime, I will start checking more nests and also look at the literature for egg dates.


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