Oh yes, I forgot to mention that if it nibbles your cables, it might set the whole tower block on fire with a short circuit. If you have mice, your neighbours will too, do the maths: Let's be conservative here... 200 flats at ONE MOUSE each, say, 100 female mice 5 or 6 offspring each female mouse (let's say 5) 8 times a year gives the second generation (mice only live 12 months) of 4000 mice, of which 2000 females with 5 offspring 8 times a year gives 80,000 mice in your block in 12 months How much did you think you liked them?