Concavenator - Sail - Day 33

Concavenator corcovatus is a carcharodontosaur, one of several medium-to-large carnivores from Cretaceous Southern Europe. Discovered in Spain in 2010, it is the only known carnosaur with a sail on its back. This sail is unlike those of the early synapsid Dimetrodon, or the spinosaurs, in that rather than being tall and thin, it was low and likely wide at the base - possibly for display, possibly for fat storage such as in today's camels, or potentially for both purposes.

Concavenator also has large bumps on its forearm bones that appear to be quill knobs, and skin impressions show that its body was covered in large alligator-like scales.