Arthropleura armata: The Gigantic Millipede

In the Carboniferous period, the Arthropleura (Arthropleura armata), a gargantuan millipede, roamed the Earth with between 32 and 64 jointed legs.

This terrifying creature is the largest land invertebrate ever discovered, capable of growing up to 8 feet long and nearly 2 feet wide, with articulated armored plates covering its entire body. It may have weighed close to 110 pounds.

Although Arthropleura likely fed primarily on plant matter and maybe smaller invertebrates, its massive size and intimidating appearance make it one of the scariest extinct animals to have ever existed.