An animated walk cycle of a tetrapod which made the Muz. PGI 1728.II.16 trackway found in the Zachelmie quarry (the Holy Cross Mountains, Poland) and dated to the early-middle Eifelian (a part of the early middle Devonian).
<a href="//commons.wikimedia.org/w/index.php?title=User:Sceptic_view&amp;action=edit&amp;redlink=1" class="new" title="User:Sceptic view (page does not exist)">Sceptic view</a>
<span class="int-own-work" lang="en">Own work</span> based on <cite style="font-style:normal">Niedźwiedzki, Grzegorz; Szrek Piotr; Narkiewicz, Katarzyna; Narkiewicz, Marek; Ahlberg, Per E. (<span class="mw-formatted-date" title="2010-01-07">2010-01-07</span>). "<a rel="nofollow" class="external text" href="https://www.academia.edu/407901/Tetrapod_Trackways_From_the_Early_Middle_Devonian_Period_of_Poland">Tetrapod trackways from the early Middle Devonian period of Poland</a>". <i>Nature</i> <b>463</b> (7277): 43–48. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" class="extiw" title="w:Digital object identifier">DOI</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1038/nature08623">10.1038/nature08623</a>. <a href="https://en.wikipedia.org/wiki/PMID" class="extiw" title="w:PMID">PMID</a> <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pubmed/20054388">20054388</a>.</cite>