I was at St. Mark's National Wildlife Refuge in Florida when I saw this Great Blue Heron catch a snake. It grabbed the snake by the head and proceeded to shake it around.
It spent quite a bit of time trying to subdue the snake.
At this point I wasn't sure but it looked to me like the snake was winning!
In the end, the Heron did win this battle. You can see the lump that the snake made in the Heron's neck as it swallowed the snake. Also, note the tip of the snake's tail hanging out of the Heron's mouth.