Looked at the ones where you are holding them again...yeah they're cayugas....feeding time!

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I am not sure how often people read here but I have a question.
I was up about 4am this week and since it was a lovely morning I sat outside with my ducks.
I noticed a smallish creature scurry from behind their pool into their coop.
A SMALL GREY MOUSE!
He absconded with some food and I chased it away.
What should I do and how should I be rid of him/her?
I cannot use poison for fear of harming my ducks.
I am worried 'its peskiness' might bring lice or mites or unwanted general 'crap' to my coddled Cayugas.