Concavenator

Concavenator is a genus of primitive carcharodontosaurian from the Early Cretaceous Period. It was slightly taller than a man, being no more than 20 feet long.

It was named after its distinguishing hump on its back, which was located in front of the hips. The shape was two hills, the front being taller and more visible than the one on the back, which is barely noticeable, with a U-shape in the middle, although looks less like a U-shape due to the small second hump behind the tall, frontal one. There is some speculation that it could be a thermal regulator. Another interesting fact is that it apparently sported quill knobs on the arms, very much like dromaeosaurs and modern day birds, thus leading to the possibility that it had feathers, although not completely covering the body, as it is likely it also had some scales.