Linked from
The 10 pages that link to Cranium, each with the reason it gives.
VertebrateRelated: A cranium is a major vertebrate feature, though its form varies widely.
Fish anatomyRelated: Its shape and joints vary with fish feeding and sensory adaptations.
HagfishRelated: Hagfish possess a cartilaginous cranium, despite lacking jaws and true vertebrae.
Head (anatomy)Related: In vertebrates, it forms the bony enclosure around the brain.