One of the star attractions at the Duke Lemur Center in Durham, North Carolina. Original image from Carol M.… Free Image from public domain license 
One of the star attractions at the Duke Lemur Center in Durham, North Carolina. Original image from Carol M.… Free Image from public domain license 
Turtle by Julie de Graag (1877-1924). Original from The Rijksmuseum. Digitally enhanced by rawpixel Free Image from public domain license 
The canaries sketch by Julie de Graag (1877-1924). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Wheelman in ‘A Red Hot Finish', illustration by John Cameron. Original from Library of Congress. Digitally enhanced by… Free Image from public domain license 
Platypus (Ornithorhynchus Paradoxus) illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from our… Free Image from public domain license 
An arrangement of nature painting of various leaves with unique designs from the book, Konversationslexikon (1894). Digitally… Free Image from public domain license 
Positions of the Hands (1910) from the work of Joseph Gibbons Richardson (1836-1886). Drawings of hand gestures for sign… Free Image from public domain license 
Fahrrader 1 (1894) from the German series, Meyers Konversations Lexikon, a black and white lithograph of different types of… Free Image from public domain license 
Lavender (Lavandula ipica) illustration from Medical Botany (1836) by John Stephenson and James Morss Churchill. Free Image from public domain license 
Sketch of a cat (1813) by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Sketch of a cat (1813) by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Rolled up lying sleeping cat (1825) by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by… Free Image from public domain license 
Sitting cat (1815) by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Lying cat (1811) by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Sketch of a cat (1819) by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Sketch of a cat (1808) by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Rolled up lying, sleeping cat by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Lying cat (1812) by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Two sparrows perched on a branch. Illustration from Seitei Kacho Gafu (1890–1891) by Wantanabe Seitei, a prominent… Free Image from public domain license 
Sitting Cat (1918) by Julie de Graag (1877-1924). Original from The Rijksmuseum . Digitally enhanced by rawpixel. Free Image from public domain license 
Two rabbits (1923-1924) by Julie de Graag (1877-1924). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
The Redwood National and State Parks. Original image from Carol M. Highsmith’s America, Library of Congress collection.… Free Image from public domain license 
Larkspur by William Morris (1834-1896). Original from The MET Museum. Digitally enhanced by rawpixel. Free Image from public domain license 
