I love the low angle shots you can get from a Kayak (or at least I assume that is how you got these). Especially this one.
Reminds me of Nate's shots... one of the things that made his water fowl shots stand out was getting that low angle (among other things), and not shooting down on them. Basically, that is what everyone in the Bird post does, but shooting straight on is more difficult with water fowl... you either have to be a belly crawler or get into a low vessel (kayak).
Pat