A northern diver (Colymbus glacialis) Colour lithograph, ca. 1875. https://www.rawpixel.com/image/13964367/northern-diver-colymbus-glacialis-colour-lithograph-ca-1875Free Image from public domain license299. Great Loon (Colymbus glacialis) 300. Red-throated Loon (Colymbus septentrionalis) illustration from Zoology of New York… https://www.rawpixel.com/image/329433/free-illustration-image-zoology-new-york-red-vintage-public-domain-birdsFree Image from public domain license