Endlein, T., Ji, A. H., Samuel, D., Yao, N., Wang, Z. Y., Barnes, W. J. P., et al. (2013). Sticking like sticky tape: tree frogs use friction forces to enhance attachment on overhanging surfaces. Journal of the Royal Society Interface, 10(80): 20120838. doi:10.1098/rsif.2012.0838.