About 2 years ago we were fishing and saw a Canadian Goose having issues swimming. Assuming it was tangled in fishing line or something, we ran it down and found a large turtle latched onto one foot. My buddy grabbed the goose (which, surprisingly, seemed to prefer being grabbed by a human to being grabbed by the turtle although the result may well have been the same), I grabbed the turtle and we managed to separate the two. Both were released and we didn't feel too badly costing the turtle his lunch. The goose would have been a wasteful amount of food and the turtle looked pretty well fed already.