Most members of the Aeshnidae family spend much of their time flying and hunting for prey, seldom resting during the day time (4). All prey is caught in flight, and these dragonflies will eat almost any soft-bodied insect that is smaller than them, including other dragonflies (3). After mating, the female deposits her eggs in aquatic vegetation or moist sand (5). The larvae are voracious predators, actively climbing over submerged vegetation to hunt for prey. Like the adults, larvae will eat anything smaller than themselves, including mosquito, damselfly and dragonfly larvae, tadpoles and even small fish. In some species, particularly in those which are well adapted to temporary waters in desert areas, larvae of this family mature in one year or even less, emerging from a split in their skin to become a dragonfly.
If the biology of its western counterpart, B. irene, applies to the Cretan spotted darner, eggs hatch rapidly after oviposition and the larval period spreads over two to three years. The larvae stay preferably within the maze of tree roots submerged in water along river banks, sometimes also at the bottom of streams or within submerged vegetation. Emergence usually occurs at night to minimise the threat of predation, as any emerging dragonfly is highly vulnerable at this time (3).