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 with the pheromone at their prey to lure them and then copulate with them. Instead of normal hybridisation, only more of their species are bred. 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 animals to observe them, it is unknown if it's used for other purposes as well since it's highly potent and can attract prey to the hunter as well if spilled. The pheromone smells overwhelmingly sweet and nauseating.