Rhinocerotidae, commonly known as rhinoceroses, are large, thick-skinned mammals native to Africa and Asia. They are characterized by one or two horns on their snouts, which are made of keratin, the same material as human hair and nails. There are five species of rhinoceroses: the white rhinoceros, black rhinoceros, Indian rhinoceros, Javan rhinoceros, and Sumatran rhinoceros. Rhinoceroses are herbivores, primarily feeding on grasses, leaves, and shoots. They play a crucial role in their ecosystems by helping to maintain the balance of vegetation. Unfortunately, many rhinoceros species are endangered due to habitat loss and poaching for their horns, which are falsely believed to have medicinal properties in some cultures.