Rhino refers to a large, herbivorous mammal that belongs to the family Rhinocerotidae. There are five species of rhinoceroses, which include the black rhino, white rhino, Indian rhino, Javan rhino and Sumatran rhino. They have a thick skin, a large head with a small tail, and two horns on their nose. Rhinoceroses are known for being aggressive and powerful animals that can weigh up to 2 tons or more. The term "rhino" is also used as a slang word meaning someone who has had plastic surgery in order to improve their appearance, particularly by having a nose job.