Kiore are the smallest and lightest of the three rats species we have most to do with.
There are three species of rats with whom humans have a close association. They are the Norway rat (Rattus norvegicus), black rat (Rattus rattus), and kiore (Rattus exulans). Kiore, at less than one third the body weight and two thirds the length of the Norway rat, is the smallest of the three. It must have been confused with a large mouse as one scientist named it Mus Exulans.
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