Found in the pitcher plants (Sarracenia, Darlingtonia, Heliamphora, Cephalotus, and Nepenthes), this is possibly how the first carnivorous plants evolved. The basic idea is a hollow leaf filled with water/digestive fluids and any prey that falls in is drowned and digested. Some of these plants release chemicals that remove surface tension, causing small bugs to sink right to the bottom. The smallest pitcher plants are a few inches, the largest is known to eat rats and birds.