Here's why:
* Skeleton: Seahorses have a bony skeleton, unlike their cartilaginous cousins like sharks and rays.
* Gills: They breathe through gills like other bony fish.
* Swim bladder: They have a swim bladder, a gas-filled sac that helps them maintain buoyancy.
* Classification: Seahorses are classified within the order Gasterosteiformes, which includes other bony fish like pipefish and sticklebacks.
So, while their unique appearance might make you think otherwise, seahorses are definitely bony fish!