Unlike the Anhinga who spear their food with their sharp straight beak the Double-Crested Cormorant hooks it’s prey.
Juveniles have pale white/brown chests with patches of darker brown and the adults are dark brown/black. These birds are powerful swimmers.
By the sizes of these, I am assuming a couple of years old. I occasionally drive around Bayport, and I am surprised that I didn’t see them when they were younger, or maybe they were breed somewhere else and moved to this location.