My cat brought in a little field mouse yesterday about 1pm. I caught him in a cup and put him in the little tank i have for wild mice my cat catches. Anyway i kept him in it until it was dark (he had a water bowl, food and a little hidey hut) and then opened up the 2 holes on the side of the cage (It's a rotastak) and left him to venture out on his own during the night. My dad checked it this morning and he's still there, So my dad tried to shoo him out but he let my dad clap him and still insisted he was staying. I think he's only young but old enough to eat solids etc but i have no idea what to do? I've closed the cage back up and put him in our caravan at the side of the house because i don't like releasing them in the daytime incase something else catches them. So what should i do