Hypsilophodon is a dinosaur popularly known as the "high-ridged tooth" that roamed the earth in the Early Cretaceous period. It was a small-sized herbivorous species that lived in the forests of Europe during the early Cretaceous period. Though widely recognized by its scientific name, there are a few synonyms to refer to this dinosaur, such as Hypsi, Hypsilophodont, and Hypsilophus. These names are commonly used interchangeably to refer to this fascinating creature that has left its mark in the pages of the earth's history. Despite its small size, the Hypsilophodon played a significant role in the web of life during its time.