A well-preserved dinosaur embryo has revealed that young titanosaurs, the largest ever dinosaurs, had nasal horns that we have never seen in adult fossils
Source:
https://www.newscientist.com/article/2253205-best-preserved-titanosaur-embryo-reveals-they-had-nose-horns-as-babies/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home