Plate 37: Bald Eagle, Turkey Vulture, Red-tailed Hawk, Duck Hawk, Osprey, Cooper's Hawk, Marsh Hawk by… https://www.rawpixel.com/image/8905401/image-watercolor-art-vintageFree Image from public domain licensePng sticker harrier bird hand drawn https://www.rawpixel.com/image/2637084/free-illustration-png-circus-birds-drawing-animal-pngView licenseHen Harrier male (Circus cyaneus) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio version… https://www.rawpixel.com/image/325800/free-illustration-image-von-wright-brothers-wrights-vintageFree Image from public domain licenseHen Harrier male (Circus cyaneus) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio version… https://www.rawpixel.com/image/325704/premium-illustration-psd-old-hen-drawings-von-wright-brothers-americaView licenseHen Harrier female (Circus cyaneus) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio… https://www.rawpixel.com/image/325633/premium-illustration-psd-harrier-abstract-americaView licenseHen Harrier female (Circus cyaneus) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio… https://www.rawpixel.com/image/325733/free-illustration-image-swedish-von-wright-brothers-henFree Image from public domain licenseMarsh Hawk from Birds of America (1827) by John James Audubon, etched by William Home Lizars. Original from University of… https://www.rawpixel.com/image/277558/free-illustration-image-audubon-hawk-birds-americaFree Image from public domain licensePng sticker harrier bird hand drawn https://www.rawpixel.com/image/2637106/free-illustration-png-animal-png-birds-drawing-vintage-animalsView license