Fun fact about Calyopteryx virgo: all members of the family Calopterygidae are ambush predators, which means that they usually remain within their own territory. Males are lazier than females, according to science, so they typically stay within 100 metres of "their" water body, while females can travel up to four kilometers.

While mating, they form a "mating wheel", which looks a bit odd - here's some Calyopteryx virgo porn from Sweden if anyone is interested.