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I have noticed that lizards feet can stick to walls but not to Teflon surfaces?

Why is that?

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Gecko feet have been the focus of a lot of research over the past 10 years.

Their ability to walk up vertical or even hanging from ceilings is attributed to tiny branching hairs growing from the pads of their feet. The hairs branch down to the size of 100s of nanometers and its believed that this gives them large surfaces on the molecular size scale, giving them a strong vanderWaals adhesion force.

Micrograph of Gecko hairs from footpad

Teflon, being hydrocarbon chains covered with 'hard' electronegative flourine atoms doesn't provide the same attraction to the hairs as vanderWaals forces rely on mutual polarizability of atoms in close contact. That is to say, electronically fluffy atoms can stick together more readily.

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