Tim Laman / Rufous-sided sticky frog (Kalophrynus pleurostigma) on the ground in the lowland rainforest, Bako National Park, Sarawak, Borneo, Malaysia

Chris Mattison / Treehole frog (Metaphrynella sundana) on yellow leaf. Sukau, Borneo, Indonesia.

Chien Lee / Asian Horned Frog (Megophrys nasuta) female and Matang Narrow-mouthed Frog (Microhyla nepenthicola) camouflaged in leaf litter, Kubah National Park, Sarawak, Malaysia

Chien Lee / Asian Horned Frog (Megophrys nasuta) female and Matang Narrow-mouthed Frog (Microhyla nepenthicola) camouflaged in leaf litter, Kubah National Park, Sarawak, Malaysia

Chien Lee / Bornean Tree-hole Frog (Metaphrynella sundana) male, Mulu National Park, Sarawak, Malaysia

Chien Lee / Borneo Narrow-mouthed Frog (Microhyla borneensis) male, Bengoh Range, Sarawak, Borneo, Malaysia

Paul Bertner / Bornean Tree-hole Frog (Metaphrynella sundana), Danum Valley Conservation Area, Sabah, Borneo, Malaysia

Paul Bertner / Bornean Tree-hole Frog (Metaphrynella sundana) eye, Mount Kinabalu National Park, Sabah, Borneo, Malaysia

Paul Bertner / Bornean Tree-hole Frog (Metaphrynella sundana), Mount Kinabalu National Park, Sabah, Borneo, Malaysia

Paul Bertner / Bornean Tree-hole Frog (Metaphrynella sundana), Danum Valley Conservation Area, Sabah, Borneo, Malaysia

Paul Bertner / Black-spotted Narrow-mouthed Frog (Kalophrynus pleurostigma), Borneo, Malaysia

Paul Bertner / Grainy Frog (Kalophrynus sp), Danum Valley Conservation Area, Sabah, Borneo, Malaysia