Thinking only snakes are men-eaters is a dangerous assumption.
Better description as requested in the comments:
RedMattis made a mod called "Lamias, Sirens, Snakemen, and other Serpents-like beings". In this mod, there is a gene called "Swallow", that let a pawn swallow another whole, but it has the prerequisite of a snake tail. This mod removes this prerequisite.
