Science Daily dwells on a bizarre reversal of the usual order of things:
…[I]n an unprecedented predator-prey role reversal, a certain group of ground beetle larvae are able to lure their amphibious would-be predators and consume them with almost 100% success.
According to the researchers, larvae of the genus Epomis combine a sit-and-wait strategy with unique movements of their antennae and mouthparts to draw the attention of an amphibian (frogs and toads were used in the study). As the amphibian, thinking it has spotted potential prey, comes closer, the larva increases the intensity of these enticing motions. Then, when the amphibian attacks, the larva almost always manages to avoid the predator’s tongue and uses its unique double-hooked mouthparts to attach itself to the amphibian’s body and initiate feeding, which can include both sucking of bodily fluids and chewing body tissues, usually killing the much larger amphibian.
Nightmarish photo at the link.