The American Polydactyl is a unique breed of domestic cat known for having extra toes on its paws. Typically, these cats have six toes on their front paws and five on their back paws, although variations can occur. This genetic trait is caused by a dominant gene, making polydactylism relatively common in certain cat populations. Originally popularized by Ernest Hemingway, who had a fondness for these cats at his home in Key West, Florida, the American Polydactyl is often characterized by its playful and friendly nature. They are known for their agility and ability to climb, which can be attributed to their extra digits.