by Cyanocorax - uploaded on August 16, 2020, 7:50 pm
A sea horse. Centuries ago, sea horses like this one were conventional motifs in art, and they were depicted pulling King Neptune's chariot across the ocean. They even appear in old zoology treatises!
Traced from the book Heraldic Crests: A Pictorial Archive of 4,424 Designs for Artists and Craftspeople by J. Fairbairn (Dover Publications), which states that the images it contains are royalty-free.