A lop bunny is one of several breeds of bunnies characterized by their floppy ears. While it may be thought by some that the floppy ears are a kind of defect that a normal rabbit would not have, the lop bunny has been around a long time. In fact lop bunnies are among the oldest breeds of rabbits that have been domesticated.While the majority of lop bunnies are kept as pets, many are bred and groomed for a place in the show ring. The American Rabbit Breeding Association recognizes five major breeds of lop bunny and has published very precise standards that rabbits belonging to one of these breeds must meet in show competition.