Lesser-Known Wonders: 30 Fascinating Dinosaurs You’ve Probably Never Heard Of

Stegouros

This Chilean ankylosaur wielded a flat tail weapon unlike anything seen before in dinosaurs. Described in 2021, Stegouros packed seven pairs of blade-like bones into its tail club, creating a deadly macuahuitl-like weapon similar to Aztec war clubs. At just six feet long, this Late Cretaceous plant-eater packed surprising defensive power for its size. The unusual tail design shows armored dinosaurs evolved diverse protection systems.