Well, either I have the world's first teleporting bluetit or the cat sneaked one in yesterday when I wasn't looking, then ignored it, only to recatch this morning when it had revived.
All I know is all hell broke loose in the kitchen, followed by madam scooting up the stairs with a guilty-looking demeanour. I thought, 'Oh help we've got mice'. Caught her vanishing under the bed, and she let go of her catch, which took the chance to fly into the stairwell.
Threw cat back into bedroom and shut the door, went for my fishing net (usually used for rescuing hoverflies out the conservatory in summer!) and finally managed to catch it and let it go.
The puzzle is we don't have a catflap and I can't recall her carrying anything in! There's a pile of feathers by the kitchen door, so I can only assume that's where it was lurking when she pounced. And at this time of the year, I don't leave any windows or doors open. Weird, eh?
moonbells
