Certain kinds prefer lakeshores, others are found only along streams, or around springs and in peatlands. Ponds and marshes rich in aquatic vegetation support the most species. Male Libellula quadrimaculata . The Odonata and their ancestors are some of the most ancient of insects. They have many primitive features, but also possess many specializations that reflect their aerial and predatory lifestyle.
Damselflies are slimmer, often smaller, and usually fly more slowly than dragonflies.
At rest their equal-sized wings are usually held together above the body. Anax junius . Larva from above showing extended labium. The aquatic larvae are predacious and are armed with an enormous hinged labium, sort of a lower lip, which is used as an extendible grasping organ for capturing prey. Larvae are voracious, eating small aquatic insects, crustaceans and even fish.