ornithischian (noun)

1. The existence of ornithischians can be traced back to the Late Triassic period, approximately 230 million years ago.

2. In a mythical kingdom, a group of ornithischian dinosaurs embark on a quest to recover a magical artifact.

3. The protagonist of the novel discovered a hidden land inhabited by intelligent ornithischians.

4. The animated series features a friendly ornithischian dinosaur as one of the main characters.