Robert Thompson / European common frog (Rana temporaria) on rock by waterfall, near Lac des Gloriettes dam, Pyrenees National Park, France, June.

Alex Hyde / Madagascar reed frog {Heterixalus madagascariensis} in front of waterfall, montane rainforest. Andasibe-Mantadia NP, Eastern Madagascar.

Piotr Naskrecki / Delalande's River Frog (Amietia quecketti) near waterfall, Gorongosa National Park, Mozambique

Jaymi Heimbuch / Cane Toad (Bufo marinus) near waterfall, Osa Peninsula, Costa Rica

Cyril Ruoso / Goliath frog (Conraua goliath) underwater waterfall, Cameroon.

Cyril Ruoso / Goliath frog (Conraua goliath) near pool with waterfall. Cameroon.

Cyril Ruoso / Goliath frog (Conraua goliath) near pool with waterfall. Cameroon.

Cyril Ruoso / Goliath frog (Conraua goliath) near pool with waterfall. Cameroon.

Cyril Ruoso / Goliath frog (Conraua goliath) near pool with waterfall. Cameroon.

Cyril Ruoso / Goliath frog (Conraua goliath) emerging from water, Cameroon.

Yashpal Rathore / Golden frog (Hylarana aurantiaca) with waterfall in background. Coorg, Karnataka, India.

Yashpal Rathore / Dancing frog (Micrixalus saxicola). Coorg, Karnataka, India. Endemic to Western Ghats. Vulnerable species