A golfer was nearly mauled by a monster-sized swan after sinking a putt on a Georgia course this week ... and the wild attack was all captured on video!!!
TMZ Sports has learned ... John Walters was out on a round with his pals in South Georgia -- when the golf outing suddenly turned into a fight with a bird.
You can see in the crazy footage ... despite a massive swan parked on the green, Walters went ahead and putted out his 5-footer.
The problem? The made shot had serious ramifications -- 'cause the swan attacked!