I had lived here 19 years before seeing my first mouse tracks across my yard in new snow.
The mouse had been a passenger inside a silk pillow that blew onto my property.
I had picked the pillow up and removed the stuffing into my garbage dumpster, whence the mouse later escaped,
crossed the yard east to the compost pile and back west, and sheltered in my garage. S/he's no longer there.
I was sad that my cat had had a stroke the day before and wouldn't be able to dispatch the mouse herself.