Input (grade 13): Because only one species of dormouse is native to the British Isles, in everyday English usage dormouse usually refers to this species (the Hazel Dormouse) rather than to the family as a whole.
Output (grade 12): Only one species of dormouse is normally found in the British Isles, so in British English "dormouse" usually means the Hazel Dormouse, not the family of dormice.