The main thing to know in this scenario is whether its a mouse and a rat? taking google as the first option of rescue the difference between either is: "When it comes to ears, mice have large, floppy ears however rats have larger ears in size compared to mice but not in respect to their body size. Mice also tend to have long, thin tails with hair but rat tails will usually be hairless and scaly." but also who has that level of patience to notice or care??!! because not ME I had this encounter recently in the office! as soon as my dad left the mouse or rat came out of its hiding place (notice the use of it because honestly if i cant distinguish between a rat or a mouse who is betting for me to do it with genders? also its not like i can speak mouse and simply ask!) and honest to god it was HUGE and SCARY and i wanted it GONE!!!! it ran up to me and looked at me for a minute whole and then ran away!(and this happen...