Giant Insects
Insects also grew well in the humid and high-oxygen conditions. One of the largest was the Meganeura. This large ancestor of the dragonfly had a wingspan of 60 to 75 cm. Another large arthropod lived on the floor of the Carboniferous forests. The Arthropleura was a giant Millipede that could grow to more than one and a half meters long.They sometimes had as many as 30 pairs of legs!