Different, and yes weird too. After all they are the ‘snake bird’.
Swamp birds stand and grab fish, Anhinga swim on the bottom and spear them. Other birds land in the trees and preen for hours. Anhinga get soaked and muddy, stand around to dry.
When they swim only their neck is above water. Oh, they can’t walk either.
And here is another habit. All the others look around the waters edge for sticks to build with.
An Anhinga will dig them out of the mud.
Which makes them twice as heavy and completely unwieldy.
But they are fun to watch.