The term 'Rainforest Beast' can be summarized by the crossword solution of 'SLOTH, ' which is a five-letter word. Sloths are slow-moving mammals that live in the tropical rainforests of Central and South America. They are known for their long, curved claws and for spending most of their lives hanging upside down from tree branches. Sloths are herbivores and feed on leaves, buds, and fruits. They are also nocturnal animals, meaning they are active at night.