I have not seen successful nesting at the Edmonds marsh heron rookery for the past 4-5 years due to the activities of the resident Pt.Edwards bald eagle pair.?? There are still? herons at the marsh and nearby marina, so I assume they are finding somewhere to nest.?
I am sure the heron-eagle, predator-prey relationship has been going on long before this area was settled, but urban development has resulted in the loss of habitat suitable for new rookeries.

Bill Anderson; Edmonds, WA. USA