Staffan Widstrand / Wild Wonders of China / Tree frog (Amolops afghanus) female sitting on moss Tongbiguan Nature Reserve, Dehong prefecture, Yunnan province, China, May.

Staffan Widstrand / Wild Wonders of China / Close up of a Tree frog (Amolops marmoratus) sitting on a green leaf at Tongbiguan Nature Reserve, Dehong prefecture, Yunnan province, China, May.

Staffan Widstrand / Wild Wonders of China / Close up of a Tree frog (Amolops marmoratus) sitting on a green leaf at Tongbiguan Nature Reserve, Dehong Prefecture, Yunnan province, China, May.

Staffan Widstrand / Wild Wonders of China / Tree frog (Amolops afghanus) female, portrait, Tongbiguan nature Reserve, Dehong prefecture, Yunnan province, China, May.

Martin Willis / Torrent Treefrog (Litoria nannotis) also known as Waterfall Frog, near creek, Kuranda, Queensland, Australia

Martin Willis / Torrent Treefrog (Litoria nannotis), also known as Waterfall Frog, in creek, Kuranda, Queensland, Australia

Martin Willis / Torrent Treefrog (Litoria nannotis), also know as Waterfall Frog, in creek, Kuranda, Queensland, Australia

Bert Willaert / Male Humayun's Wrinkled Frog (Nyctibatrachus humayuni) from leaf above stream, by egg clutches. Western Ghats, India.

Kevin Schafer / Torrent Treefrog (Litoria nannotis) in waterfall spray, Atherton Tableland, Queensland, Australia

Alex Hyde / Madagascar tree / Leaf litter frog {Boophis madagascariensis} at night by rainforest stream. Masoala Peninsula National Park, north east Madagascar.

Nick Garbutt / Madagascar Giant Stream frog (Mantidactylus guttulatus) active at night on banks of small stream in rainforest. Andasibe-Mantadia National Park, Madagascar. (NB-this is Madagascar's largest native f...

Bruce Thomson / Waterfall frog (Litoria nannotis) resting on a wet rock near waterfall at night, Wooroonooran National Park, Wet Tropics World Heritage area, Queensland, Australia.