Happened across a television program a few days back where bird watcher's were filming a unique little bird from south america called..the White capped Dipper.
This little bird is truly aquatic and feeds on aquatic insect's and other small crustacean's in very fast flowing streams, while holding itself at times on near verticle moss covered rocks at water falls, or actually swimming through torrent's in search of food.
I performed google search, and did find a couple videos of this behaivor but it took viewing several sites to see good video.
Is most amazing bird I think I have ever seen.
Wish I could provide a link but I am technologicaly challenged
For those wishing to see truly amazing little aquatic bird,, the search for info and videos of them in action will be worth it.
Couple videos I found just showed the little birds sitting on rocks but further searching will reveal more!