What Is the big animal with one horn?

The big animal with one horn is the rhinoceros, specifically the species known as the unicorn rhinoceros, often referred to simply as a "unicorn" in popular culture. Rhinos are large, thick-skinned herbivores found in Africa and parts of Asia. They possess a single horn made of keratin, the same material as human hair and nails. This unique feature has made them iconic, although they are also endangered due to poaching and habitat loss.