Aaron Ellison, a principal researcher at Harvard Forest, a long-standing ecological research area of Harvard University, specializes in carnivorous plants. He highlights the Nepenthes rajah, a species native to Borneo, as the largest carnivorous plant. This endangered plant can consume small mammals such as rats, in addition to insects. The plant's waxy, pitcher-shaped structure lures prey with its scent, causing them to slip inside and be digested by its fluids. Ellison suggests that people interested in seeing the largest specimen can view online images, noting that it can grow up to 41 centimeters in length and hold up to 4 liters of water. In comparison, the largest carnivorous plants in the United States are limited to capturing small prey like salamanders. Ellison also studies the purple pitcher plant (Sarracenia purpurea), a species found in New England. Inside its pitcher, microorganisms such as bacteria, protozoa, and larvae of mosquitoes and flies help break down captured prey, similar to the digestive process in human or animal stomachs. This means the pitcher can be viewed as a kind of miniature stomach. However, the question remains: what is the most deadly fate for an animal caught in a carnivorous plant's trap? Ellison has a particular interest in the Utricularia genus, which includes over 200 species and is known for its highly efficient trapping mechanism. These freshwater plants have tiny bladders with a small air pocket underwater, surrounded by two fine hairs. Small aquatic creatures, such as crustaceans or copepods, might mistake these for prey. Once the creature touches the hairs, a valve opens, and the plant rapidly sucks the animal inside. The first action the plant takes is to expel the water, causing the prey to drown in the air trapped inside. Ellison describes this as a particularly unpleasant way to die. Despite the fascination with carnivorous plants, their survival is threatened by both environmental changes and human activity. In addition to suffering from pollution and habitat loss, these plants face a growing threat from their own popularity. Some species, such as the Venus flytrap, are endangered due to poaching for the black market. Ellison notes that while people are captivated by these plants, their increasing popularity may ultimately harm them. Evolution, he adds, is a strange and complex process, and the relationship between plants and their prey continues to evolve in unexpected ways.