An image of an <a href="https://en.wikipedia.org/wiki/elk" class="extiw" title="w:elk">elk</a> from <i>A History of Land Mammals in the Western Hemisphere</i>.
<a href="https://en.wikipedia.org/wiki/Robert_Bruce_Horsfall" class="extiw" title="w:Robert Bruce Horsfall">Robert Bruce Horsfall</a>
<a rel="nofollow" class="external text" href="https://archive.org/stream/historyoflandmam00scot"><i>A History of Land Mammals in the Western Hemisphere</i></a>, page 155