Arthropleura was an extinct, massive millipede-like arthropod that lived around 300 million years ago during the Carboniferous period. Measuring up to 2.4 meters (7.8 feet) in length, it is considered the largest known land invertebrate in Earth’s history. This colossal creature thrived in the lush, swampy forests of what is now Europe and North America. Its size is attributed to the high oxygen levels of the Carboniferous atmosphere and the absence of large terrestrial predators at the time. De