Concavenator

Concavenator was a medium-sized meat-eating dinosaur that prowled the wetlands of Early Cretaceous Spain around 125 million years ago. As a member of the Carcharodontosauridae family—the same lineage that would later produce giants like Giganotosaurus—Concavenator gives us a rare glimpse at these fearsome predators before they reached their enormous sizes. With powerful jaws, sharp teeth, and strong legs, it was clearly an apex predator of its ecosystem.

The most striking feature of Concavenator is the dramatic triangular hump formed by extremely tall neural spines on two vertebrae just in front of its hips. This sail-like structure remains a mystery—scientists have proposed it could have been used for display, temperature regulation, fat storage, or species recognition. Whatever its purpose, nothing quite like it has been found in any other theropod dinosaur.

Equally intriguing are the small bumps, called quill knobs, found along its forearm bones. In modern birds, similar structures anchor large feathers. If these bumps served the same function in Concavenator, it would suggest that even large carnivorous dinosaurs outside the direct bird lineage may have sported some feathery covering—though this interpretation remains debated among paleontologists.

Concavenator was discovered at the Las Hoyas fossil site in Spain's Cuenca Province, a location famous for its exceptionally preserved Early Cretaceous fossils. The nearly complete skeleton was described in 2010 by paleontologists Francisco Ortega, Fernando Escaso, and José Luis Sanz. The name means 'hunchback hunter from Cuenca,' perfectly capturing both its distinctive anatomy and its Spanish homeland.