To save, maybe not. But we sure did it for other reasons -- like say to hurt others, or for economic reasons. One example is:<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Bison_hunting" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Bison_hunting</a><p>We went from 30 million on North American continent around 16th century, to a few hundred around 19th century.