Yep you are right haro, thanks for the info. They do look similar, the bittern does not have the dark cap..........
Well the gbh has been bypassing the pond, so now I need to fight the green heron lol
from the net:
The green heron feeds at the edge of the water. It eats mostly small fish, but it also eats crustaceans, mollusks, insects, reptiles, amphibians, spiders and leeches.
The green heron breeds in most of the eastern United States from the Canadian border south to the Gulf of Mexico and west to the Great Plains, western Texas and southwestern New Mexico. On the Pacific coast, it breeds from British Columbia south to California and Arizona. It winters in coastal California, southern Arizona and Texas, along the Gulf coast and along the Atlantic coast north to South Carolina.
So I just need to adjust the edge of the water protection. Remove its ability to walk the bog wall.
Those are beautiful woodpeckers haro, so neat you saw one.