If you follow the following link to the website iNaturalist, there is an interesting shot of a Northern Watersnake (Nerodia sipedon) that was found thrashing around by the water, with its head trapped by a Chinese Mystery Snail.

I am assuming the snake bit the snail's body while the snail was active underwater, and then I assume the snail retracted its body into its shell, and attempted to close its operculum all the way, trapping the snake's head and leaving its lower jaw stretched out under the shell.

http://www.inaturalist.org/observations/3530469#activity_comment_625198

Quite interesting I thought, but it looks very painful for both parties.

Susan

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