Page 149 from a <a href="//commons.wikimedia.org/wiki/1900" title="1900">1900</a> Russian edition of <a href="//commons.wikimedia.org/wiki/Alfred_Edmund_Brehm" class="mw-redirect" title="Alfred Edmund Brehm">Alfred Edmund Brehm</a>'s <i>Tierleben</i> illustrating the concept of <i>Гады</i> (<i>Amphibia</i>) as of the late XIXth century.
Original: Unknown, Digital image: <a href="//commons.wikimedia.org/wiki/User:Alexei_Kouprianov" title="User:Alexei Kouprianov">Alexei Kouprianov</a>
Digitalized <a href="//commons.wikimedia.org/wiki/February_18" title="February 18">February 18</a>, <a href="//commons.wikimedia.org/wiki/2007" title="2007">2007</a>
<a href="//commons.wikimedia.org/wiki/Brehms_Tierleben" class="mw-redirect" title="Brehms Tierleben">Brehms Tierleben</a> (Russian edition of 1900)