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BiologyNepenthes rajah is a carnivorous plant, which flowers all year round; the enormous pitchers can hold up to one litre of fluid (2). Insects are attracted to the plants by a fragrant odour but the waxy surface of the inside of the pitcher does not provide support, and the plant's victims tumble into the fluid below. A powerful digestive acid is then released from the pitcher walls, which consumes the prey (4). The gigantic pitcher of Nepenthes rajah is said to capture rats, frogs and lizards as well as insects (2).