Mouse /mus/
medallion 3.3 cm in diameter
The text of the bestiary and that of Pseudo-Hugh /III.25/ come from “Etymologiae” by Isidor /XII. III.1.2./ who derived the word “mus” from the mouse being born of soil humidity /ex-humore, humus/. From Pliny /XI.37.76/ is derived the idea that the liver of a mouse gets bigger and smaller with the waxing and waning of the moon.