An international research team working in the Sahara desert of Niger has identified a striking new species of Spinosaurus.
The fossils belong to a large, semi-aquatic predator that specialised in catching fish.
Its most remarkable feature is a long, curved crest that rises from the skull like a sabre.
This distinctive horn earned the animal the vivid nickname the "hell heron".
Remarkably, it is the first new member of the Spinosaurus group to be described in more than a century.
Studying its anatomy allows palaeontologists to reconstruct how such giants moved and fed near ancient waterways.
The find adds valuable evidence that some large dinosaurs were closely tied to watery habitats.