Tim Laman / Harlequin Tree Frog (Rhacophorus pardalis) in the air with webbed feet spread to glide, Danum Valley Conservation Area, Sabah, Borneo, Malaysia

Nick Garbutt / Harlequin Tree Frog (Rhacophorus pardalis). Danum Valley, Sabah, Borneo

Nick Garbutt / Harlequin Tree Frog {Rhacophorus pardalis} portrait, Danum Valley, Sabah, Borneo.

Pete Oxford / Harlequin Poison Arrow Frog {Dendrobates histrionicus} Ecuador

Pete Oxford / Pebas stubfoot toad (Atelopus spumarius) captive occurs in the Amazon Basin. Vulnerable species.

Nick Garbutt / Harlequin tree frogs (Rhacophorus pardalis) in amplexus, gathered at temporary breeding pool formed after rain. Danum Valley, Sabah, Borneo.

Chris Mattison / Harlequin poison dart frog (Oophaga histrionica), captive, occurs in Ecuador

Roland Seitre / Harlequin Poison Dart Frog (Oophaga histrionica), yellow spotted morph. Captive, Cali Zoo, Cali, Colombia.

Roland Seitre / Harlequin Poison Dart Frog (Oophaga histrionica), red morph. Captive, Cali Zoo, Cali, Colombia.

Roland Seitre / Harlequin Poison Dart Frog (Oophaga histrionica), red spotted morph. Captive. Cali Zoo, Cali, Colombia.

Roland Seitre / Harlequin Poison Dart Frog (Oophaga histrionica), orange morph. Captive. Cali Zoo, Cali, Colombia.

Roland Seitre / Harlequin Poison Dart Frog (Oophaga histrionica). Captive. Cali Zoo, Cali, Colombia.