Show off your love of paleontology with this retro, distressed-inspired design featuring two Pachycephalosaurus locking their thick domed skulls beneath the bold "CLONK" caption. Native to the Late Cretaceous Period, these iconic dome-headed dinosaurs are often associated with head-butting behavior, making this navy blue line-art graphic on a natural cream shirt a fun tribute to one of prehistory's most recognizable herbivores. Made from 100% ring-spun cotton (high-quality cotton) with a soft, sensory-friendly feel. Every order funds kelp restoration on the Pacific Northwest coast.