• Andersson, M. (1994). Sexual selection. Princeton, NJ: Princeton University Press.
  • Blackburn, D.C., Hanken, J. & Jenkins, F.A. Jr (2008). Concealed weapons: erectile claws in African frogs. Biol. Lett. 4, 355357.
  • Brockes, J.P. & Kumar, A. (2005). Appendage regeneration in adult vertebrates and implications for regenerative medicine. Science 310, 19191823.
  • Brodie, E.D. Jr, Nussbaum, R.A. & DiGiovanni, M. (1984). Antipredator adaptations of Asian salamanders (Salamandridae). Herpetologica 40, 5668.
  • Endo, H., Yamagiwa, D., Hayashi, Y., Koie, H., Yamaya, Y. & Kimura, J. (1999). Role of the giant panda's ‘pseudo-thumb’. Nature 397, 309310.
  • Fabrezi, M. (2001). A survey of prepollex and prehallux variation in anuran limbs. Zool. J. Linn. Soc. 131, 227248.
  • Hutchinson, J.R., Delmer, C., Miller, C.E., Hildebrandt, T., Pitsillides, A.A. & Boyde, A. (2011). From flat foot to fat foot: structure, ontogeny, function, and evolution of elephant ‘sixth toes’. Science 334, 16991703.
  • Iwai, N. (2010). Predation behavior of the Otton frog – stealing prey from a Ryukyu water snake. Bull. Herpetol. Soc. Jpn. 2010, 103105.
  • Kluge, A.G. (1981). The life history, social organization, and parental behavior of Hyla rosenbergi Boulenger, a nest-building gladiator frog. Miscellaneous publications, Museum of Zoology, University of Michigan 160, 1–170.
  • Maeda, N. & Matsui, M. (1999). Frogs and toads of Japan. Tokyo: Bun-ichi Sogo Shuppan.
  • Matsui, M. (2011). On the brown frogs from the Ryukyu Archipelago, Japan, with descriptions of two new species (Amphibia, Anura). Curr. Herpetol. 30, 111128.
  • Mishima, S. (1966). Studies on the poisonous snake ‘Habu’, Trimeresurus flavoviridis flavoviridis. I. Food habit of Trimeresurus flavoviridis flavoviridis on the Amami Islands. Sanit. Zool. 17, 121.
  • Peters, S.E. & Aulner, D.A. (2000). Sexual dimorphism in forelimb muscles of the bullfrog, Rana catesbeiana: a functional analysis of isometric contractile properties. J. Exp. Biol. 203, 36393654.
  • Roček, Z. & Rage, J.C. (2000). Proanuran stages (Triadobatrachus, Czatkobatrahus). In Amphibian biology Vol. 4. Palaeontology: 12831294. Heatwole, H. & Carroll, R.L. (Eds). Chipping Norton: Surrey Beatty and Sons.
  • Sánchez-Villagra, M.R. & Menke, P.R. (2005). The mole's thumb – evolution of the hand skeleton in talpids (Mammalia). Zoology 108, 312.
  • Shine, R. (1979). Sexual selection and sexual dimorphism in the amphibia. Copeia 1979, 297306.
  • Tokita, M. & Iwai, N. (2010). Development of the pseudothumb in frogs. Biol. Lett. 6, 517520.
  • Wells, K.D. (2007). The ecology and behavior of amphibians. Chicago: University of Chicago Press.