* Spiny body: Most have spines or bony plates on their bodies.
* Pelvic fins: They have pelvic fins located on their chest, rather than their belly.
* Usually small: The majority of these fishes are quite small, though some species can grow up to 30 cm.
Here are some of the animals in the same order as seahorses:
* Sticklebacks: These small fish are known for their elaborate mating rituals and their defensive spines.
* Pipefishes: Close relatives of seahorses, pipefishes have long, slender bodies and resemble a pipe.
* Seamoths: These fishes are also called "ghost pipefishes" and have elaborate appendages and camouflage that resembles seaweed.
* Seahorses: These unique fishes are known for their distinctive equine head and vertical posture.
Interestingly, there are over 100 species of fish in this order, so it's a pretty diverse group!