What is leaving their droppings overnight in my 'kitchen'????

I'm in the process of extending my house, so I am living upstairs out of the bedrooms.
I was about to start making my porridge this morning when I was horrified to see that something has nibbled the cork stopper of the container that holds my porridge and left droppings.
I did see some in my porridge yesterday, but assumed they were seeds and ate it anyway
Any ideas?

I was about to start making my porridge this morning when I was horrified to see that something has nibbled the cork stopper of the container that holds my porridge and left droppings.
I did see some in my porridge yesterday, but assumed they were seeds and ate it anyway

Any ideas?

Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
Wisdom is not putting it in a fruit salad.
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The droppings seem extremely small for a mouse at only around 1mm
Are you sure??
Wisdom is not putting it in a fruit salad.
Not really what I wanted to hear, especially as I've eaten some...
Now I've got to try and find where they are and do something about it.
There are boxes of my belongings stacked almost to ceiling height.
I'll have to put down some poison
Thanks again
Wisdom is not putting it in a fruit salad.