Chilesaurus diegosuarezi, a unique theropod dinosaur from the Late Jurassic period, is known for its herbivorous diet, despite belonging to a typically carnivorous group. It had a small skull, leaf-shaped teeth, and a beaked mouth, resembling a combination of various dinosaur traits. Found in Patagonia, it played a unique role in its ecosystem.

Chilesaurus diegosuarezi was discovered in the Aysén Region of Patagonia in southern Chile. This region is part of the Magallanes and Chilean Antarctic region, known for its diverse and unique paleontological record.

During the Late Jurassic period, when Chilesaurus lived, the region was characterized by a temperate climate with lush vegetation, including coniferous forests and ferns. The environment was likely humid with significant seasonal variations, supporting a variety of flora and fauna.

Chilesaurus was a herbivorous dinosaur, which is unusual for theropods, traditionally known as carnivores. It occupied a niche similar to that of other herbivorous dinosaurs, feeding on plants in the underbrush and possibly browsing from low-level bushes. The unique combination of traits suggests it was well-adapted to a specific ecological role within its habitat.