I've only ever seen a Black Crowned Night Heron once before, at it was also here at the Los Angeles Arboretum near the small lake. I saw the first one on the bent trunk of a tree and was able to get close enough for my zoom to take good shots. Then less than as I left that one, about 20 yards away there was another. I didn't post any of those shots.
BLACK CROWNED NIGHT HERON
I've only ever seen the black or dark grey cormorans. This is the first time I've seen these light gray ones.