Scientists in Argentina, in South America, have discovered fossils of a tiny, herbivorous dinosaur with spikes on its back.
The dinosaur was part of the Cretaceous period, the last era of the dinosaurs, and it lived between 97 million and 94 million years ago.
The dinosaur, named Jakapil kaniukura, belonged to a species called the thyreophoran. They were herbivores: four-footed dinosaurs with spiky bones along their necks to their tails.
The little dinosaur weighed about the same as a cat, and its teeth were leaf-shaped.
It's likely that Jakapil walked upright, and had a beak. It could probably give a strong bite.
In the photo, the scientists are carefully digging out the fossils.
