Oftentimes, they hunt in groups where large numbers of termites or ants are flying, or near swarms of mayflies , caddisflies, or gnats. Maturing dragonfly larvae feed very intensively, as do females when developing their eggs. Studies show that food shortage may limit reproductive behavior. Dragonflies do not hunt in cold weather. Damselflies, however, are not as limited by temperature and have been observed hunting during cold spells.
Males are territorial, sometimes patrolling for prey for hours at a time.
Though dragonflies are predators, they themselves must be wary of many predators. Birds , lizards, frogs , spiders , fish, water bugs, and even other large dragonflies have all been seen eating odonates. However, dragonflies have many adaptations enabling them to avoid predation. They have exceptional visual responses and truly agile flight. Although many insects perform courtship, it is uncommon among dragonflies.