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However, there is also the Leseratte. In German, you can attach certain words to Ratte ("rat") to coin a term for someone who likes something: A Wasserratte (Wasser means "water") is a person who loves to be in the water, while a Landratte is a person who doesn't, or at least doesn't like to set foot on a ship. Lesen means "to read", and a Leseratte is a person who loves to read. In distinction to a Bücherwurm, though, there is no implication that this person has no life outside of booksan "avid reader" comes close in English, but doesn't conjure up the image of a voraciously reading rat, which I find very appealing (and I'm a person who suffers from muriphobia!). Anyway, I think a Leseratte and a Bücherwurm make a nicely contrasting pair.
[Source: Wild Things in the German Language: Kindle version | iBook version]