The term 'Thick-Skinned Beast' can be summarized as a rhino, which is a five-letter word. Rhinos are large mammals that are native to Africa and parts of Asia. They are known for their thick skin, which is made up of layers of collagen and fatty tissue. They also have two horns on their snouts, which are made of keratin. Rhinos are herbivores and are considered to be an endangered species due to poaching and habitat loss.