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The most common “true” mouse is the house mouse, or scientifically known as Mus musculus species of rodents. The Latin behind the meaning of the rodent’s genius species name can be translated into “mouse, small mouse,” As for the house reference in the common name, it is derived from the house mouse being commonly found in the in homes, shelters, or buildings throughout the year. The Muroid families are divided into six families, 20 subfamilies, around 275 to 285 genera, and at least 1250 to 1300 species. The term mouse is used commonly to name small Muroid rodents, which are a superfamily of rodents. The mice and mouse name covers over 1,000 or more mice and mice like species. The genus shows evidence of more speciation as years go by. There are over 35 to 40 species of rodents including other genus’s and the Mus genus.
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Of course if your DM really wants to screw with you: If I was your high druid mentor, I would consider it mandatory fieldwork. If I was your DM, I would certainly allow it. There may even be a niche for somebody to open a zoo aimed purely at aspiring druids. Is it any different from changing into an owl and spending the nights observing creatures, or soaring on thermals as an eagle during the day? Personally I think it is the natural thing to do.(play on words fully intentional.)
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Some people will accuse you of metagaming (I think they are wrong) and some people will remind you that the DM chooses the exact type of creature that is summoned. Seems like such an obvious thing for a druid to do (and yet, I don't think I'd of thought of it!)
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