Even though it’s early to start the real nest building certain actions have already begun.
The claiming of prime real estate has the early arrivals skirmishing. This Heron chased a rival numerous times. At one point the other bird even went so far as to land on the same branch.
Above you can see she was having none of it. This is the ‘I am done just yelling at you’ position. She does not look happy.
The other Heron moved a few trees away, it was prudent.