Standard mouse size, if not smaller.
Seriously, google “deer mouse,” or even “compare deer mouse vs field mouse.”
Deer mice have oversize eyes, and they creep me out. I say they are aliens.
~VOW
Slightly smaller than moose mice, one would imagine…
Their size doesn’t matter as much as the fact that they are legion, AND ya gotta remember that those lil fuckers were bred to survive and even thrive in the Arizona desert. Our flimsy human constructions are nothing compared the forces of nature those assholes overcome on a daily basis.