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Thanks for the comment, (and sorry for the answer delay ) :)

I used to have rats as pets when I was younger, so I'm quite used to their behavior, and by the way they can be really interesting dudes to deal with... Quite the same level of interaction than with a dog (ok, a very small one :D ) when it comes to play or pet.

BUT that something to have them as funny little companions, and another one to see them invite their own friends to invade the place and start crunching everything at teeth range :D

Anyways ! Not seen any since a few days, so I think the situation is ok for now :)
Have a nice day :)