We won't tell them the picture was from Bellevue/Redmond...
It must be mating season for the Great Blue Herons.
As I was walking Lilly through the dog park, the trees were full of these birds. In clumps of 2 to 5 per tree. A few single birds would try to land on one of the trees and get run off by one of the birds there.
Sadly, I was running late for work and didn't have time to get some better pictures.