Unusual trunk formation on a Hillgrove Gum (<i>Eucalyptus michaeliana</i>), The Big Lease, OWRNP, Walcha, NSW, Australia. Aboriginals sometimes split and grafted tree trunks in this manner to indicate the boundaries of their territory.
<a href="//commons.wikimedia.org/wiki/User:Cgoodwin" title="User:Cgoodwin">Cgoodwin</a>
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<span class="int-own-work" lang="en">Own work</span>