This is the fossil upon which the T shirt design was based. This striking fossil of Dimetrodon, displayed at the Fick Fossil and History Museum in Oakley, Kansas, showcases one of the most recognizable and misunderstood prehistoric animals. Despite its dinosaur-like appearance, Dimetrodon lived nearly 50 million years before the first dinosaurs and is more closely related to mammals than reptiles. The standout feature of this Permian-era predator is the large sail on its back, formed by elongated neural spines, which may have been used for thermoregulation or display. The Fick Museum, located near the fossil-rich Niobrara Chalk beds, presents this remarkable specimen as part of its mission to highlight the prehistoric life that once thrived in Kansas. This fossil not only draws attention with its dramatic silhouette but also helps educate visitors about evolution and the deep history of life on Earth long before dinosaurs ruled the land.