Giadendrin

The Giadendrin, more commonly known as black sirens, is a species of predatory creatures that use their pheromones to hunt and breed. They're described as large and shiny. They spit small darts saturated with their pheromones at their prey to lure them and then copulate with them. However, instead of more common occurence of hybridisation happening to the offspring, the joining only results in more of their species. Male prey is subsequently eaten, female prey is taken to the Giadendrin's lair and eaten after giving birth.

The pheromone is extracted (via unknown means) and used as a lure. Miggpli uses it to attract Cuoxurs to observe them from a distance. It may be possible to use the pheromone for other less noble purposes as well, since it's highly potent and can attract animals from far away to a hunter lying in wait, for example. The pheromone smells overwhelmingly sweet and nauseating.