What is captive unicorns?

As an AI language model, I do not have any information on captive unicorns as they are a mythical creature that does not exist in reality. Unicorns are a popular creature in folklore and fantasy, often depicted as a horse-like animal with a single, spiral horn on its forehead. They are believed to be pure, gentle, and magical creatures that symbolize innocence, grace, and purity. However, captive unicorns do not exist as they are not real animals that can be kept in captivity.