 The study examined the morphology of the inner ear of sharks, rays, and skates using MRI. It found that the size of the inner ear was related to the type of prey consumed and the environment in which the animal lived. Pisyverous sharks had larger inner ears than non-pisyverous species, while reef-associated species had larger inner ears than oceanic species. This suggests that the size of the inner ear may be linked to the animal's ability to detect sounds in their environment.