In another species, which I found and profiled a year and a half ago, instead of the triungulins hanging around on flower petals, waiting patiently for a bee to happen along, they take a more proactive approach. Once they hatch, all at roughly the same time, they crawl up a twig or grass stem and form a large cluster at the top, about the size of a bee. Then they emit a pheromone that smells just like the female of the species of bee they want to lure in. When the horny male arrives they all climb on board and then transfer to the female when he finally finds a real one.