Anhinga (snake bird) fish underwater. Like a Cormorant they have no oils in their feathers to help them swim.
However, drying off here can be a problem…predators love them.
I think this young lady was in the water a little too long. She was drenched and unable to fly. This log was best she could do.
Above is a good example of just how wet they can get.
A few good shakes and a some sun had her dry enough to get airborne and on higher ground.