End?

I went to view the rookery yesterday at four pm. Saw one heron on a nest and heard another vocalizing, but was surprised by the overall lack of activity; did not see any herons fly in or out.

Not sure what this means. Last year the young fledged right before the mid-August "official" end of the breeding season (i.e. when construction can begin).

My first thought was that the warm weather had sped up the season.