SEM of toe pads of White’s tree frog

Adhesive surface of the frog toe pad. (a) Immature White’s tree frog (Litoria caerulea) (b) Low resolution scanning electron microscopy (SEM)
image of the whole pad of a juvenile frog; (c) Medium resolution SEM image showing the mucous pore and (mainly) hexagonal epithelial cells separated by channels at their distal ends; (d) High resolution SEM image showing the presence of nanostructures on the surface of the epithelial cells.