Fig. 8From: Tree frog attachment: mechanisms, challenges, and perspectivesHypothesised regimes of mucus drainage in a tree frog’s toe pad. A Far field regime. B Intermediate field regime. C Near field regime. D Drainage through the nanochannel network and E the nanopillar-substrate gap. DI dimple, EC epidermal cell, NP nanopillar. dg gap width, u flow speed. Modified after [99]. Printed with permissionBack to article page