Beetle

>>2185252
>put beetle in water
>inadvertently reveal answer to yourself
It's a water beetle.

>>2185252
Common Ground Beetle, Carabus something, can't remember what species but it's the most common one in the UK.

Looks like a darkling beetle. Predatory (eat other bugs) as adults.

If you have rotting wood down there they may be eating it as larvae (the larvae are essentially like mealworms)

>>2185252
Key it out with a dichotomous key.

You'll probably need a magnifying device of some sort.

File: Ground2.jpg (184KB, 600x449px) Image search: [Google]

184KB, 600x449px

>>2185254
Remembered it, Pterostichus melanarius. Ignore the other anons, they're taking the piss.

Thanks everyone? Do you think I should do something about it?

And it's not in water btw

Well... it is now, down the toilet

everyone.*

>>2185262
Leave them alone. They eat slugs and other undesirables, they're good guys.

Hm, maybe I'll throw them outside like I do with spiders. They are so creepy though, and one of them once bit my sister too