Larus argentatus is a species of gull. There are over 50 species of gulls worldwide. This hat comes in a wide variety of colors. The bird image has been scanned from lithographs in an 1844 book, “Zoology of New York, or the New-York Fauna, Part II, Birds." The storeowner at ZephyrusBooks' Store at Zazzle explains at the page for this hat that the artwork is by J. W. Hill, and the author of the book is James De Kay. Click on the image to read more.