Thomas Marent / Rosenberg's Gladiator Tree Frog (Hypsiboas rosenbergi), Piedras Blancas National Park, Costa Rica

Pete Oxford / Rosenberg's Gladiator Tree Frog (Hypsiboas rosenbergi), northwest Ecuador

Pete Oxford / Rosenberg's Gladiator Tree Frog (Hypsiboas rosenbergi), northwest Ecuador

Pete Oxford / Rosenberg's Gladiator Tree Frog (Hypsiboas rosenbergi), northwest Ecuador

Pete Oxford / Rosenberg's Gladiator Tree Frog (Hypsiboas rosenbergi), northwest Ecuador

Philippe Clement / Rosenberg's Gladiator Frog (Hyla rosenbergi) on branch, Costa Rica, Carara NP

Philippe Clement / Rosenberg's Gladiator Frog {Hypsiboas rosenbergi} climbing tree trunk, Carara NP, Costa Rica.

Philippe Clement / Rosenberg's Gladiator Frog (Hyla rosenbergi) on leaf, Costa Rica, Carara NP

Pete Oxford / Rosenberg's Gladiator Tree Frog (Hypsiboas rosenbergi) clinging to leaf in rainforest, Ecuador

Pete Oxford / Rosenberg's Gladiator Tree Frog (Hypsiboas rosenbergi) on leaf showing webbed feet, Choco Ecoregion, San Lorenzo northwestern Ecuador

Piotr Naskrecki / Rosenberg's Gladiator Tree Frog (Hypsiboas rosenbergi), Costa Rica

Maxime Aliaga / Rosenberg's tree frog (Hypsiboas rosenbergi) Mache chindul reserve, Choco, Ecuador