Nettie Ballard

I went to a private pond today bass fishing and something just totally crazy and freaky happened, there was a duck near the edge of the pond in the water he dives his head down and next thing you know his head is still in the water his wings are flapping with all its might and his head continues to stay under the water and it's stay there for a few minutes and I'm thinking what in the world is going on I thought maybe it had a big fish in its mouth the next thing you know I noticed that something's not right its head is looking odd so I go over there where the duck was go up to my boots and take a stick and get him out of the water it was a duck that had big feathers on its head everything was gone his feathers all the meat of its face it was just bare skin I was wondering since I've never seen anything like this do you have any idea what could have got this duck