Wood wasp is a name given to various and unrelated families of Symphyta that have one thing in common. As larva, they all live in dead wood. An example of a wood wasp would be a Greater Horntail whose larva feed on dead wood. As adults, the Greater Horntail looks very impressive while being rather large at 40mm's in length and having a long needle at the tip of their abdomen. It looks very dangerous, however the long needle is not a sting as they are harmless. Instead, the needle looking ovipositor is used for laying eggs in the trunks of dead coniferous trees. They are common around the UK and found near coniferous wood from May till October. The larva of a Greater Horntail will feed on tree wood for between two to four years before changing into an adult. The life cycle of a wood wasp begins with the female inserting her ovipositor into a piece of wood that is dead or dying and very weak. She then lays up to 7 eggs that will hatch in 3 to 4 weeks time.