Meet the giant African millipede (Archispirostreptus gigas)—emphasis on giant. It's the largest of the world’s 12,000 millipede species, grows up to 13 inches long, and sports up to 400 teeny widdle legs. | California Academy of Sciences

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