Image by Birger Strahl via Unsplash

Image from Biodiversity Heritage Library via Flickr

Image via the Met Museum

Image by Tony Phan via Unsplash

Image via the Walters Art Museum

Image by Vidar Nordli-Mathisen via Unsplash

Image by Bisakha Datta via Unsplash

Image by Ajay Karpur via Unsplash

Image by Tobi via Unsplash

Image by Ashim Ayed via Unsplash

Image by Kelly Sikkema via Unsplash

Image by Biodiversity Heritage Library via Flickr

Image courtesy of Dr. Walter Tschinkel

Image by Timothy Dykes via Unsplash

Image by Quinn Buffing via Unsplash

Image by Rock’n Roll Monkey via Unsplash

Illustration by Camillo Golgi via Wikipedia

Image by Kunal Shinde via Unsplash

Image by Ben Pauer via Unsplash

Image by v2osk via Unsplash

Photo by Geoff Brooks via Unsplash

Image by Ahmad Odeh via Unsplash

Photo by Nikoline Arns via Unsplash

National Cancer Institute via Unsplash

Image by Unseen Histories via Unsplash

Detail of painting by Alexander van Haecken via Rijks Museum

Photo by Vinicius “amnx” Amano via Unsplash

Image by Geran de Klerk via Unsplash

Photo by Gabriel Dizzi via Unsplash

Photo by Peter Conlan via Unsplash

Via the Metropolitan Museum of Art

Photo by Braydon Anderson via Unsplash

Photo by Chris Charles via Unsplash

Photo by Markus Spiske via Unsplash

Photo by Angela Compagnone on Unsplash

Photo by Biodiversity Heritage Library via Flickr

Photo by Kensy Cooperrider

Photo by Jonathan Cosens Photography on Unsplash

Photo by Deo realist on Unsplash

Image courtesy of Bill Thompson

Painting by Charles R. Knight via Staten Island Museum

Photo by Biodiversity Heritage Library via Flickr

Photo by Hadis Safari on Unsplash

Image courtesy of Alecia Carter

Photo by Alexander Sinn on Unsplash

Photo by Tim Foster on Unsplash

Photo by William Henry Jackson via Wikimedia Commons

Photo by Carl Solder on Unsplash

Photo by USAID Africa Bureau via Wikimedia Commons

Photo by Robert Anasch on Unsplash

Photo by NASA via Wikimedia Commons

Photo by Michelle Tresemer on Unsplash

Photo by Tanaphong Toochinda on Unsplash

Photo by Goban1 via Wikimedia Commons

Image courtesy of Matt Crosby

Photo by Joe deSousa on isorepublic.com

Photo by Dmitry Grigoriev on Unsplash