Hand drawing of birds collection illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio version… https://www.rawpixel.com/image/326115/premium-illustration-psd-eagle-tawny-owl-sparrowhawkView licenseHybrid between Black grouse and Willow ptarmigan (Lyrurus tetrix ♂ x lagopus lagopus ♀) illustrated by the von Wright… https://www.rawpixel.com/image/326039/free-illustration-image-grouse-von-wright-brothers-birdFree Image from public domain licenseRough-legged Hawk (TRIORCHIS LAGOPUS) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio… https://www.rawpixel.com/image/326090/free-illustration-image-von-wright-brothers-bird-hawk-vintageFree Image from public domain licenseRock ptarmigan (Lagopus mutus) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio version of… https://www.rawpixel.com/image/325994/free-illustration-image-von-wright-brothers-wright-birdFree Image from public domain licenseWillow ptarmigan male (Lagopus lagopus) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio… https://www.rawpixel.com/image/326013/free-illustration-image-von-wright-brothers-century-birdFree Image from public domain licenseWillow ptarmigan (Lagopus lagopus ) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio… https://www.rawpixel.com/image/325973/free-illustration-image-von-wright-brothers-wright-birdFree Image from public domain licenseHybrid between Western capercaillie and Willow ptarmigan (Tetrao urogallus x lagopus lagopus) illustrated by the von Wright… https://www.rawpixel.com/image/326016/free-illustration-image-von-wright-brothers-tetrao-urogallus-birdFree Image from public domain licenseWillow ptarmigan female (Lagopus lagoups) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio… https://www.rawpixel.com/image/325958/free-illustration-image-von-wright-brothers-animals-1900sFree Image from public domain licenseHybrid between Black grouse and Willow ptarmigan (Yrurus tetrix x lagopus lagopus) illustrated by the von Wright brothers.… https://www.rawpixel.com/image/325969/free-illustration-image-von-wright-brothers-grouse-vintageFree Image from public domain licenseHybrid between Black grouse and Willow ptarmigan (Yrurus tetrix x lagopus lagopus) illustrated by the von Wright brothers.… https://www.rawpixel.com/image/326328/premium-illustration-psd-america-ancient-animalView licenseWillow ptarmigan male (Lagopus lagopus) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio… https://www.rawpixel.com/image/326272/premium-illustration-psd-america-ancient-animalView licenseHybrid between Western capercaillie and Willow ptarmigan ♂ (Tetrao urogallus x lagopus lagopus) illustrated by the von… https://www.rawpixel.com/image/326212/premium-illustration-psd-america-ancient-animalView licenseWillow ptarmigan female (Lagopus lagoups) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio… https://www.rawpixel.com/image/326331/premium-illustration-psd-america-ancient-animalView licenseHybrid between Black grouse and Willow ptarmigan (Lyrurus tetrix ♂ x lagopus lagopus ♀) illustrated by the von Wright… https://www.rawpixel.com/image/326275/premium-illustration-psd-america-ancient-animalView licenseWillow ptarmigan (Lagopus lagopus ) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio… https://www.rawpixel.com/image/326247/premium-illustration-psd-america-ancient-animalView licenseRock ptarmigan (Lagopus mutus) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio version of… https://www.rawpixel.com/image/326329/premium-illustration-psd-america-ancient-animalView licenseRough-legged Hawk (TRIORCHIS LAGOPUS) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio… https://www.rawpixel.com/image/326173/premium-illustration-psd-von-wright-brothers-america-ancientView license