Horridus the Triceratops is one of the most complete Triceratops skeletons in the world. At least 267 of the known 313 bones of a Triceratops skeleton are present (85%) and nearly all of them are intact. Some bone fragments have not yet been identified and may be parts of the bones currently thought to be missing. Replicas of the missing bones were made for display and painted grey to distinguish them from the preserved bones. Where a bone is missing that is preserved on the other side of the skeleton a mirror image of the preserved bone has been made. Where a bone is not preserved the replica was based on bones from other Triceratops specimens or other ceratopsid species.

Specimen Details