This is a medieval manuscript illustration of a fantastical creature. It appears to be a fish-like reptile with legs. The creature has a large, elongated body covered in a pattern of diagonal lines, resembling scales. Its head is fish-like with a gaping mouth filled with teeth. It has a long, curved tail and four legs with clawed feet. The creature is standing on a wavy green ground, suggesting water or grass. The illustration is framed by a decorative border with a repeating pattern of blue and brown. The style is characteristic of medieval illuminated manuscripts, with flat colors and stylized forms.