....well, it's a hippocampus. I'm not sure where they're from, maybe Greek mythology? Yeah, I think so, I remember some underwater diety type having them pull a chariot. Makes sense because imagine trying to get a saddle cinch to stay on those slippery scales, and bareback riding would just plain be uncomfortable. I threw my whole 'mammal vs. fish' argument out the window because it was more fun making the horse part look fishy.