The two Heron Photographs were taken only a few minutes apart, and in the same spot. Well, as close as they could be without the one chasing off the other.
Great Blue Heron are territorial and prefer to be alone. Unless it’s their mate a show down, usually just a loud harmless chase, will happen.
Above is the dominant bird. A full adult, standing alert. You can see the colors are defined. The chest and neck feathers are also thick and long flowing.
Now we see a juvenile Great Blue. Probably from this springs brood in the nearby rookery.
The difference when side by side is easier to see. The colors are bland, even on the head. All the feathers are much shorter. The chest feathers are stubby and not grown out. Another few months they will look the same.
Also, see how the bird above is gasping for air… poor guy has been chased by adults most of the morning. That’s OK. This spring he will be an adult and the same ones chasing him will be chased right back. Maybe even steal a girlfriend/boyfriend from one.