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

Steven David Miller / Heath Monitor {Varanus rosenbergi} foraging in burnt heathland, Summer, Cape Le Grand National Park, Western Australia

Robert Valentic / Rosenberg's monitor, male threat display {Varanus rosenbergi} South Australia

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

Juergen & Christine Sohns / Rosenberg's Monitor (Varanus rosenbergi) climbing, Parndana, Kangaroo Island, South Australia, Australia