Ridgeling is a term used to describe a male animal that has one or both testicles undescended. Synonyms for ridgeling include cryptorchid, ridged, uncastrated, incompletely gelded, and cull. In the equine world, a ridgeling horse is also referred to as a "rig," "ridger," or "horse with a ridgling condition." Additionally, the term "high baller" is sometimes used to refer to a male horse with one descended testicle and one that is not descended. In farming, a ridgeling bull is called a "stagg," while a pig with undescended testicles is referred to as a "skewbald." It is important to identify ridgelings because they are typically sterile and can pass the genetic trait of undescended testicles to their offspring.