Scottis Fold cats..

"Scottish Fold, breed of shorthaired cat, the result of a genetic mutation that causes the ears to fold down. All Scottish folds can trace their ancestry back to Susie, the first fold-eared cat, who was discovered in Scotland in 1961 by Mary and William Ross, the founders of the breed. Susie's parents were ordinary farm cats; her folded ears were the result of a spontaneous genetic mutation."