This River Otter Anatomy t-shirt showcases a vintage, textbook-style skeletal diagram of Lontra canadensis, reflecting the scientific study of modern mammals that evolved and diversified during the Cenozoic Era. Rendered in crisp white linework on a deep black background, the retro anatomical illustration highlights bone structure with museum-quality educational detail. Made from 100% ring-spun cotton (high-quality cotton) with a soft, sensory-friendly feel. Every order funds kelp restoration on the Pacific Northwest coast.