The American Curl name directly describes the breed's most distinctive feature—the uniquely curved ears that curl backward—combined with its geographic origin in the United States. The breed was named when it gained formal recognition in the 1980s, with "curl" specifically referring to the ear shape that defines the breed. The name has remained consistent across all major cat registries including The International Cat Association (TICA), the Cat Fanciers' Association (CFA), and international organizations worldwide.
Within the breed, there are two coat length varieties: shorthaired and longhaired. Both varieties share identical breed standards aside from coat length and grooming requirements. The longhaired variety is sometimes specified as "American Curl Longhair" or "Longhair American Curl" to distinguish it from the shorthaired variety. However, both are considered the same breed—American Curl—with coat length being the only significant difference. Both varieties can appear in the same litter.
The breed is occasionally nicknamed "the cat with the smile in its ears" or "smiley cat" due to the curved ears that create the impression of a perpetual smile or happy expression. This whimsical nickname captures the breed's cheerful appearance and pleasant temperament. Some enthusiasts also call them "Peter Pan cats" because they retain kitten-like playfulness and curiosity throughout their lives, never seeming to fully grow up in personality.
No official alternate names exist for the breed, though casual abbreviations like "AC" or "Curl" are sometimes used in breeding circles and among owners for convenience. These shortened forms are widely understood but informal, not appearing in official registry documentation. The breed is always officially registered as "American Curl" regardless of coat length.
The American Curl is officially recognized by all major cat registries. TICA granted championship status in 1987, remarkably quickly after the breed's discovery in 1981. CFA followed with championship status in 1993. International registries including FIFe and others have also recognized the breed. This rapid and widespread recognition reflects the breed's distinctive appearance, appealing personality, and the responsible development program established by early breeders.
The breed's development included careful documentation of the genetic mutation causing the ear curl. Early breeders worked with geneticists to understand the inheritance pattern, discovering that the curl gene is dominant and affects ear cartilage development. This scientific approach helped establish the breed's legitimacy and health profile, contributing to swift registry acceptance.
Both shorthaired and longhaired American Curls are equally valued and shown in cat shows, with separate divisions for coat length in most registries. The longhaired variety often shows more dramatic presentation due to their flowing coats, though both varieties display the distinctive ear curl equally. Some people prefer one coat length over the other based on aesthetic preferences or grooming considerations, but both represent the breed equally.

