Christa Behmenburg (Germany) has 27,623 items relating to mice and rats that she has been collecting since the 1980’s.

Within this collection Christa has 206 telephone cards, 124 bookmarks, 5,470 figurines, 13,854 postcards and various other unusual items including cigarette cards and money. In addition to her job as a librarian, Christa privately works on a study entitled Mice and Rats in the History and Culture of Mankind. She also keeps a number of rats as pets.