巨脉蜻蜓是一种相当大的蜻蜓。和大多数蜻蜓一样，巨脉蜻蜓也是食肉的。但它通常不会主动攻击，除非是被激怒或者为了食物被挑战。它主要生活在湿地，比如沼泽中。巨脉蜻蜓是岛上大多数较小昆虫的天敌。 虽然巨脉蜻蜓不常具有攻击性，它也不会拒绝免费的食物。当它们捕捉到风中的血腥气，它们会从大范围内飞过去进行盛宴。 在进食时它们会变得极具攻击性，如果一大群巨脉蜻蜓已经聚集在已死亡的生物周围，这对附近的任何人和任何东西都是致命的。
Common name: Meganeura
Species: Meganeura quatpenna
Time: Late Carboniferous
Meganeura quatpenna is an especially large species of dragonfly. Like most dragonflies, Meganeura is carnivorous, but it is not likely to attack unless provoked or challenged for food. It lives primarily in wetlands, such as the swamps. Meganeura is a natural predator of most of the smaller insects on the island. Though not often aggressive, Meganeura will not turn down a free meal. Once they catch wind of a carcass, they will fly in from a large radius to feast. While eating, Meganeura become very aggressive, which can be deadly for anyone or anything nearby if a large group has gathered around the deceased creature.
The size of the insects on the Island confounds me. The way these creatures diffuse oxygen should limit their size, but Meganeura (and other bugs) seem to be able to advance beyond this restraint. If there is an abnormal concentration of oxygen in the Island's air, this could explain Meganeura's growth!