JRT, I spotted your problem immediately. You will never be able to approach these creatures if you reek of soap. Regular bathing is absurd, especially if soap is used, although the occasional dip in a stream is acceptable. Then if you really want to zone in on those nervous birds, visit the local cow pasture and roll in a couple of meadow muffins - three is better but one is simply not enough.
I had ruled out Brent's since I seem to remember you mentioning an orange or yellow bill. 'S' neck implies possible Anhinga. I'd still bet at Double-crested Cormorant, I believe the crest is only visible from about March 'til May.
"you know you've done a wheels up landing when it takes full power to taxi."
