![Ursus Maritimus Polar Bear Illustration From Quadrupeds Illustrations From Nature Schreber 1846](https://ctgpublishing.com/wp-content/uploads/2014/01/ursus-maritimus-polar-bear-illustration-from-quadrupeds-illustrations-from-nature-schreber-1846-1024x767.jpg)
Ursus Maritimus Polar Bear Illustration From Die Säugthiere in Abbildungen nach der Natur (Quadrupeds Illustrations From Nature) published 1846 by Johann Christian Daniel Schreber (1739-1810)
![Polar Bear Ursus Maritimus Illustration By John Woodhouse Audubon circa 1851](https://ctgpublishing.com/wp-content/uploads/2014/01/polar-bear-ursus-maritimus-by-john-woodhouse-audubon-1851--1024x748.jpg)
Polar Bear Ursus Maritimus Illustration By John Woodhouse Audubon (son of John James Audubon) circa 1851
![Bullock's Nature Museum at Piccadilly, London from Ackermann's Repository 1810](https://ctgpublishing.com/wp-content/uploads/2013/10/bullocks-nature-museum-at-piccadilly-1810-1024x678.jpg)
Bullock’s Nature Museum at Piccadilly, London from Ackermann’s Repository 1810