Geckos cling to walls using static electricity
It’s long been thought that geckos are able to climb vertical walls due to a phenomenon known as van der Waals forces, which involves intermolecular interactions between hairs on the lizard’s feet and the surface it’s walking on.
However, in recent years some scientists have begun to question this theory, instead positing that the gecko’s spider-like abilities are actually caused by static electricity. Contact electrification could be at play: this would mean that when the gecko’s toe pads are stuck to the wall, they become positively charged with electricity, while the wall’s surface becomes negatively charged, keeping the reptile stuck to it.
The only surface a gecko can’t stick to is Teflon. However, if water is applied then geckos can adhere to it