Abstract
Strong adhesion between solids with rough surfaces is only possible if at least one of thesolids is elastically very soft. Some lizards and spiders are able to adhere (dryadhesion) and move on very rough vertical surfaces due to very compliant surfacelayers on their attachment pads. Flies, bugs, grasshoppers and tree frogs have lesscompliant pad surface layers, and in these cases adhesion to rough surfaces isonly possible because the animals inject a wetting liquid into the pad–substratecontact area, which generates a relative long-range attractive interaction due to theformation of capillary bridges. In this presentation I will discuss some aspects ofwet adhesion for tree frogs and give some comments related to tire applications.
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