Video of Mediterranean house gecko <i>Hemidactylus turcicus</i> on teflon pan. Locality: Pelješac, Croatia. Gecko is unable to crawl up on teflon. It has non-stick surface with very low surface tension. Teflon consist of atoms of carbon and atoms of fluorine. Electrons of fluorine are very tightly bounded. Therefore there are very weak van der Waals forces.
<bdi><a href="https://www.wikidata.org/wiki/Q58300160" class="extiw" title="d:Q58300160"><span title="Czech malacologist and Wikipedian">Michal Maňas</span></a>
</bdi>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>. Recorded with Olympus u7040 as MP4 file. Converted by <a class="external text" href="https://tools.wmflabs.org/videoconvert/index.php">Commons Video Convert</a> set to highest quality into webm file.