What could fill the crocodilian niche in colder climes?

In populating a fenland region similar to the Somerset Levels in England, I'm finding a need for an aquatic ambush predator to haunt the region and snack on the occasional disrespectful traveler who forgets to make the appropriate sacrifices. It's a role that's traditionally filled by crocodiles in more deserty cultures, but what could do that job in the higher latitudes?

If there's a real, extant animal that can do the job, that's ideal, I just can't think of one. If there's a real, prehistoric animal that filled the niche, that's the next best thing. If necessary, I'm not above making something up, but I'd rather keep things based on reality.

So - what animal could function as an aquatic ambush predator in a northern European climate?

posted over 7 years ago

Werrf‭

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