Pitcher plants stay in one place but hunt moving creatures by their art of lethal attraction. Some of the pitcher plants consume small rodents, snakes, and insects in whole. But not all of the plants nitrogen needs are met by the food it consumes. Hence it has evolved to attract tree shrews and some species of bats to use pitcher plant as a toilet bowl. The plant does not feed on these creatures as it needs their poop, a great fertilizer.
Hope the plant inspires us to rethink about the nutrients present in our own excreta.