From the website my carnivore com-
A pitcher plant works by creating an inescapable trap for a bug. First, a bug smells a nice nectar smell and is drawn towards the beautiful green, red, yellow, and even purple colors on the plants. As the bug lands on the neck of the pitcher, it becomes shaded by the hood, losing track of where the light is coming from. Sharp downward pointing hairs act as bayonets inside the pitcher plant that force the bug down the tube. The wall underneath these hairs is very slippery, eliminating any chance for escape. As the bug slides down the long tube, it gets wedged against the narrowing tube. As it comes to rest, it will be slowly digested and become a tasty meal for the pitcher plant.