The first time I saw a sea horse, it was preserved as a dried-out husk as part of my best-friend’s seashell collection. It was fascinating and delicate. As a horse lover, sea horses have a special place in my heart.
I’m not sure when and where I learned about the males carrying the babies, but it was a long time ago.
They move slow and unlike most fish, move very slowly. Their tails are prehensile, and they have tiny snouts and boney plates. 
Their scientific classification is Hippocampus. In Greek mythology, the Hippocamp was a mythical water horse often connected to the sea god Poseidon. 
One of my writer friends, Emory Gayle includes a water horse inspired by the hippocamp in her Water series, a young adult series about mermaids. It’s a binge-worthy series. She’s a talented author and I wish I had half her writing skill.
I have plans to include a small sea horse friend for my main character in my mermaid WIP.
Sea dragons are not sea horses despite their similar appearances. Sea dragons come in many shapes and sizes like the Leafy Sea Dragon.  They resemble seaweed as they float about.