Woman holding cats (1898) print in high resolution by Edward Penfield. Original from The New York Public Library. Digitally… Free Image from public domain license 
The Large Cow Lying Down (1929) print in high resolution by Ernst Ludwig Kirchner. Original from The National Gallery of Art.… Free Image from public domain license 
Tiger in a Cave (ca. 1814) painting in high resolution by Jacques–Laurent Agasse. Original from The Yale University Art… Free Image from public domain license 
Clouded Leopards (ca. 1825) painting in high resolution by Jacques–Laurent Agasse. Original from The Yale University… Free Image from public domain license 
Zebra (1803) painting in high resolution by Jacques–Laurent Agasse. Original from The Yale University Art Gallery.… Free Image from public domain license 
A Lady's Grey Hunter (ca. 1806) painting in high resolution by Jacques–Laurent Agasse. Original from The Yale… Free Image from public domain license 
Eagle Head, Manchester, Massachusetts (High Tide) (1870) by Winslow Homer. Original from The MET museum. Digitally enhanced… Free Image from public domain license 
Two Parrots on a Barren Tree (ca.1916) by Charles Demuth. Original from Yale University Art Gallery. Digitally enhanced by… Free Image from public domain license 
C.–C. = Fisch (1931) by Paul Klee. Original from The Minneapolis Institute of Art. Digitally enhanced by rawpixel. Free Image from public domain license 
Cats under a tree (1898) print in high resolution by Edward Penfield. Original from The New York Public Library. Digitally… Free Image from public domain license 
American Flamingo (2009) by Mehgan Murphy. Original from Smithsonian's National Zoo. Digitally enhanced by rawpixel. Free Image from public domain license 
Butterfly, Caterpillar, Moth, Insects, and Currants (1650–1655) painting in high resolution by Jan van Kessel. Original… Free Image from public domain license 
Insects, Butterflies, and a Grasshopper during 17th century painting in high resolution by Jan van Kessel. Original from The… Free Image from public domain license 
Couple in a carriage (ca.1902) print in high resolution by Edward Penfield. Original from Library of Congress. Digitally… Free Image from public domain license 
Cows in Spring (1933) print in high resolution by Ernst Ludwig Kirchner. Original from The Detroit Institute of Arts.… Free Image from public domain license 
Woman holding a horse racing ticket (1895) print in high resolution by Edward Penfield. Original from Library of Congress.… Free Image from public domain license 
Red Siskin (2016). Original from Smithsonian's National Zoo. Digitally enhanced by rawpixel. Free Image from public domain license 
Horses in landscape (1928) painting in high resolution by Leo Gestel. Original from The Rijksmuseum. Digitally enhanced by… Free Image from public domain license 
Robin on a Maple Branch (1935) by Ohara Koson. Original from The Los Angeles County Museum of Art. Digitally enhanced by… Free Image from public domain license 
African Lion (2011) by Mehgan Murphy. Original from Smithsonian's National Zoo. Digitally enhanced by rawpixel. Free Image from public domain license 
Cheetah (2014) by Ronda Gregorio. Original from Smithsonian's National Zoo. Digitally enhanced by rawpixel. Free Image from public domain license 
Lowland Gorilla (2002) by Jessie Cohen. Original from Smithsonian's National Zoo. Digitally enhanced by rawpixel. Free Image from public domain license 
Giant Leaf–tailed Gecko (2010) by Smithsonian Institution. Original from Smithsonian's National Zoo. Digitally enhanced… Free Image from public domain license 
Two-toed Sloth (2018) by Stan Bysshe. Original from Smithsonian's National Zoo. Digitally enhanced by rawpixel. Free Image from public domain license 
American Bison (2011) by Joe Alderman. Original from Smithsonian's National Zoo. Digitally enhanced by rawpixel. Free Image from public domain license 
Sumatran Tiger (2009) by Mehgan Murphy. Original from Smithsonian's National Zoo. Digitally enhanced by rawpixel. Free Image from public domain license 
Giant Panda (1985) by Jessie Cohen. Original from Smithsonian's National Zoo. Digitally enhanced by rawpixel. Free Image from public domain license 
Vietnamese Mossy Frog (2006). Original from Smithsonian's National Zoo. Digitally enhanced by rawpixel. Free Image from public domain license 
Pegasus, dove, woman's head, heraldry and hand with rose (ca. 1939–1941) drawing in high resolution by Leo Gestel.… Free Image from public domain license 
Rearing horse (ca. 1891–1941) drawing in high resolution by Leo Gestel. Original from The Rijksmuseum. Digitally… Free Image from public domain license 
Hedgehog (ca. 1891–1941) drawing in high resolution by Leo Gestel. Original from The Rijksmuseum. Digitally enhanced by… Free Image from public domain license 
Cat with Tomato Plant (1931) print in high resolution by Hiroaki Takahashi. Original from The Los Angeles County Museum of… Free Image from public domain license 
Black Cat Hissing 20th century print in high resolution by Hiroaki Takahashi. Original from The Los Angeles County Museum of… Free Image from public domain license 
Ashi ni shigi (1877–1945) by Ohara Koson. Original from The Clark Art Institute. Digitally enhanced by rawpixel. Free Image from public domain license 
Gray Wolf (2012) by Brittany Steff. Original from Smithsonian's National Zoo. Digitally enhanced by rawpixel. Free Image from public domain license 
Pauw met kippen (1878–1910) print in high resolution by Theo van Hoytema. Original from The Rijksmuseum. Digitally… Free Image from public domain license 
White Rabbit with Herald's Costume Design (1915) for Alice in Wonderland in high resolution by William Penhallow Henderson.… Free Image from public domain license 
Trochilidae–Kolibris from Kunstformen der Natur (1904) by Ernst Haeckel. Original from Library of Congress. Digitally… Free Image from public domain license 
Greyhound (1912) print in high resolution by Moriz Jung. Original from the MET Museum. Digitally enhanced by rawpixel. Free Image from public domain license 
Boven- en onderaanzicht van een vlinder by Georgius Jacobus Johannes van Os (1782–1861). Original from The Rijksmuseum.… Free Image from public domain license 
Bulldog (1912) print in high resolution by Moriz Jung. Original from the MET Museum. Digitally enhanced by rawpixel. Free Image from public domain license 
Pitbull Terrier (1912) print in high resolution by Moriz Jung. Original from the MET Museum. Digitally enhanced by rawpixel. Free Image from public domain license 
Studieblad met planten en watervogels (study sheet with plants and waterfowl) by Joseph August Knip (1777–1847).… Free Image from public domain license 
Floral Designs with a Blue Bird (ca. 1773) by Giacomo Cavenezia. Original from Original from The Cleveland Museum of Art.… Free Image from public domain license 
Cranes from Momoyogusa–Flowers of a Hundred Generations (1909) by Kamisaka Sekka. Original from the The New York Public… Free Image from public domain license 
Blossoming Cherry on a Moonlit Night (ca. 1932) by Ohara Koson (1877–1945). Original from the Los Angeles County Museum… Free Image from public domain license 
Young Woman with Ibis (ca. 1860–1862) painting in high resolution by Edgar Degas. Original from The MET Museum.… Free Image from public domain license 
Ascidiae–Seescheiden from Kunstformen der Natur (1904) by Ernst Haeckel. Original from Library of Congress. Digitally… Free Image from public domain license 
Sortilèges: Evening dress, de Beer (1922) fashion illustration in high resolution by George Barbier. Original from The… Free Image from public domain license 
White Rabbit (1915) Costume Design for Alice in Wonderland in high resolution by William Penhallow Henderson. Original from… Free Image from public domain license 
Cerfs et arbres, papier peint. Écureuil oiseaux et sorbier, bordure from L'animal dans la décoration (1897)… Free Image from public domain license 
Terrestrial Mollusk, Poppy Anemone, and Crane Fly from Mira Calligraphiae Monumenta or The Model Book of Calligraphy… Free Image from public domain license 
Bird with Plum Blossoms (18th Century) painting in high resolution by Zhang Ruoai. Original from The Cleveland Museum of Art.… Free Image from public domain license 
L'Arbre de science: Robe du soir de Doeuillet (1914) fashion illustration in high resolution by George Barbier. Original from… Free Image from public domain license 
The 18th century illustration of a European green woodpecker on a branch with rose and forget me nots. Original from The… Free Image from public domain license 
Orchideae–Denusblumen / A. Giltsch, gem from Kunstformen der Natur (1904) by Ernst Haeckel. Original from Library of… Free Image from public domain license 
Greyhound (1912) print in high resolution by Moriz Jung. Original from the MET Museum. Digitally enhanced by rawpixel. Free Image from public domain license 
Bloodless Giraffe Hunt (Unblutige Jagd auf Giraffen) (1911) print in high resolution by Moriz Jung. Original from the MET… Free Image from public domain license 
Kerstnacht (1894) print in high resolution by Theo van Hoytema. Original from The Rijksmuseum. Digitally enhanced by… Free Image from public domain license 
Le Gout des Laques (1920) fashion illustration in high resolution by George Barbier. Original from The Beinecke Rare Book &… Free Image from public domain license 
Guide for Constructing the Letter R from Mira Calligraphiae Monumenta or The Model Book of Calligraphy (1561–1596) by… Free Image from public domain license 
Orangutan (Orangoetan) (1914) print in high resolution by Samuel Jessurun de Mesquita. Original from The Rijksmuseum.… Free Image from public domain license 
Fly, Caterpillar, Pear, and Centipede from Mira Calligraphiae Monumenta or The Model Book of Calligraphy (1561–1596) by… Free Image from public domain license 
Leptomedusae–Faltenquallen from Kunstformen der Natur (1904) by Ernst Haeckel. Original from Library of Congress.… Free Image from public domain license 
Ara (c.1926) print in high resolution by Samuel Jessurun de Mesquita. Original from The Rijksmuseum. Digitally enhanced by… Free Image from public domain license 
Siphonophorae–Staatsquallen from Kunstformen der Natur (1904) by Ernst Haeckel. Original from Library of Congress.… Free Image from public domain license 
Scarlet Ibis with an Egg (1699–1700) by Maria Sibylla Merian. Original from The Rijksmuseum. Digitally enhanced by… Free Image from public domain license 
Chiarini's Circus (Sekai daiichi charine daikyokuba) (1886) by Utagawa Masanobu. Original from The MET Museum. Digitally… Free Image from public domain license 
Deer from Momoyogusa–Flowers of a Hundred Generations (1909) by Kamisaka Sekka. Original from the The New York Public… Free Image from public domain license 
Cygne sauvage from L'animal dans la décoration (1897) illustrated by Maurice Pillard Verneuil. Original from the The… Free Image from public domain license 
Two Paintings of Deer Antlers (ca. 1762–1767) by The Qianlong Emperor. Original from The MET Museum. Digitally enhanced… Free Image from public domain license 
Horned owl (Hoornuil) (1915) print in high resolution by Samuel Jessurun de Mesquita. Original from The Rijksmuseum.… Free Image from public domain license 
The 18th century illustration of a black and white mottled bird on tulip stem with daffodils and butterflies. Original from… Free Image from public domain license 
Oiseaux. Libellules. Mouches. Chauve-souris. Écureuils et noisettes. Cygnes, bordures from L'animal dans la… Free Image from public domain license 
Rose of Heaven from The Flower Book (1905) by Sir Edward Burne–Jones. Original from The Birmingham Museum. Digitally… Free Image from public domain license 
Floral Designs with Birds and Griffon (1784) by Giacomo Cavenezia. Original from Original from The Cleveland Museum of Art.… Free Image from public domain license 
White Chinese Geese Swimming by Reeds by (1928) Ohara Koson. Original from the Los Angeles County Museum of Art. Digitally… Free Image from public domain license 
Study of a Horse (ca. 1817–1818) drawing in high resolution by Théodore Gericault. Original from The MET Museum.… Free Image from public domain license 
The Tiger of Ryōkoku from the series True Scenes by Hirokage (1860) by Utagawa Hirokage. Original from The MET Museum.… Free Image from public domain license 
Leaping Brook Trout chromolithograph (1874) by Samuel Kilbourne. Original from Museum of New Zealand. Digitally enhanced by… Free Image from public domain license 
Common and Golden Carp (1935) by Ohara Koson. Original from the Los Angeles County Museum of Art. Digitally enhanced by… Free Image from public domain license 
Goshawk on Snow-covered Pine Bough by Ohara Koson (1877–1945). Original from the Los Angeles County Museum of Art.… Free Image from public domain license 
Thalamophora–Kammerlinge from Kunstformen der Natur (1904) by Ernst Haeckel. Original from Library of Congress.… Free Image from public domain license 
Insects and Fruits (1660–1665) by Jan van Kessel. Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Vijf ooievaars in een wei (ca. 1878–1917) print in high resolution by Theo van Hoytema. Original from The Rijksmuseum.… Free Image from public domain license 
Discomedusae–Schweibenquallen from Kunstformen der Natur (1904) Ernst Haeckel. Original from Library of Congress.… Free Image from public domain license 
The 18th century illustration of a bird perched on a branch which bears a pear, red and white blossoms, and leaves with a… Free Image from public domain license 
The Dark Veinlet from The Butterflies and Moths of America Part 3 (1862) published by Louis Prang & Co. Original from The MET… Free Image from public domain license 
Head of a Leonberger (c.1880–c.1892) drawing in high resolution by Otto Eerelman. Original from The Rijksmuseum.… Free Image from public domain license 
Stephoidea–Ringelstrahlinge from Kunstformen der Natur (1904) by Ernst Haeckel. Original from Library of Congress.… Free Image from public domain license 
Antilopina–Antilopen from Kunstformen der Natur (1904) by Ernst Haeckel. Original from Library of Congress. Digitally… Free Image from public domain license 
Twee zilverreigers (1878–1905) print in high resolution by Theo van Hoytema. Original from The Rijksmuseum. Digitally… Free Image from public domain license 
Egrets and Reeds in Moonlight (1926) by Ohara Koson. Original from the Los Angeles County Museum of Art. Digitally enhanced… Free Image from public domain license 
Cat with Kittens (1844) painting in high resolution by Henriëtte Ronner. Original from The Rijksmuseum. Digitally… Free Image from public domain license 
Asteridea–Seesterne from Kunstformen der Natur (1904) by Ernst Haeckel. Original from Library of Congress. Digitally… Free Image from public domain license 
Great Indian Fruit Bat (ca. 1777–1782). Original from The MET Museum. Digitally enhanced by rawpixel. Free Image from public domain license 
Roodborstje op besneeuwde boomtak (1878–1910) print in high resolution by Theo van Hoytema. Original from The… Free Image from public domain license 
Pappagallo detto arara rossa del Brasile (Macaw) by Saverio Manetti (1723–1785). Original from The Beinecke Rare Book &… Free Image from public domain license 
The 18th century illustration of a brown bird with red head on carnation stem with butterflies. Original from The… Free Image from public domain license 
Twee japonnen van Doeuillet (1921) by Pierre Morgue, published in Gazette du Bon Ton. Original from The Rijksmuseum.… Free Image from public domain license