Welcome to the forum Eileen, lots of nice folks on the forum to give good advice to help with your journey.
Thanks for the photo, if it is poo then it is from an insect that shouldn’t be taking up residency in the hive.
Maybe something like a cockroach which I have occasionally found in my hives. Bees don’t seem to be able to sting them.
I doubt it is a mouse, the bees will quickly sting it to death not giving it time to do that amount of pooing.
Take your time with your next full inspection to find what it is being untidy. I wouldn’t rush out to the hive now but something to look into at your next inspection.
Cheers
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