Historical distribution of Caspian tiger (<i>Panthera tigris tigris</i>).
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1) <a class="external free" href="https://commons.wikimedia.org/wiki/File:BlankMap-World.png">https://commons.wikimedia.org/wiki/File:BlankMap-World.png</a>
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2) <a rel="nofollow" class="external free" href="https://www.sciencedirect.com/science/article/abs/pii/S0006320716308151">https://www.sciencedirect.com/science/article/abs/pii/S0006320716308151</a>
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<span class="int-own-work" lang="en">Own work</span>