The pitchers function as a kind of lantern, similar as the hoods of Darlingtonia californica. When an isect has fed from the nectar on the peristome, it flies towards the light that floods through the window on the back of the pitcher and falls into the digestion fluid. The real way out is shaded by the lid of the pitcher. This capture-principle is only found twice inNepenthes, here and in Nepenthes klossii.