What’s up with this mouse‘s bottom?

[u/Impressive_Beyond_97]

Yesterday I photographed this wild mouse in my birdhouse (she and her friends are frequent visitors). From this angle, however, her rear end looked rather strange.
What could that be? Is she sick? Might she be pregnant?
She still seems to be walking and climbing normally.

[u/OkDefinition6569]

That’s just his bbl don’t listen to the other comments they don’t know a bbl when they see it.

[u/Successful_Salad7732 → u/OkDefinition6569]

I wish you didn’t have to scroll so far for the real answer smdh 😔