>
> I have only one summer sighting of RTHA at Marymoor, so I my guess is
> that they do not nest there.
>

I have seen several RTHA together at Marymoor during the summer. On several
occasions, I've seen at least two together. Two years ago, I saw four at
once, which was probably a family group. On another occasion, I saw one RTHA
come down towards another with talons extended; it appeared to be a playful
or mating gesture. I don't recall the exact time of year for any of these
sightings, except that they were doing the warm months. Sorry.

So, I think that RTHA nest at Marymoor, or north along the river, but I
don't know where the nest is. A project for next summer!

Dean dean at amc.com