Edwin Giesbers / Lemon-yellow tree frog (Hyla savignyi) climbing up grass stem. Cyprus. April.

Edwin Giesbers / Lemon-yellow tree frog (Hyla savignyi) Cyprus. April.

David Perpinan / Male Mediterranean tree frog (Hyla meridionalis) calling, showing vocal sac inflating, Barcelona, Spain, May. Filmed at night with an infrared camera.

Lucas Bustamante / Troschel's tree frog / Calcar tree / Convict tree frog (Hypsiboas calcaratus) portrait, on leaf, Cuyabeno, Sucumbios, Ecuador.

Alex Hyde / Hourglass treefrog (Dendropsophus ebraccatus) male with inflated vocal sac calling at night, Central Caribbean foothills, Costa Rica

Lucas Bustamante / Sarayacu clownfrog (Dendropsophus sarayacuensis) with its clutch of eggs developing and starting to drop off from a leaf into the water below, where the tadpoles will develop. Sumaco National Park, N...

Pascal Pittorino / Mediterranean tree frogs (Hyla meridionalis) mating on a branch of Quince tree (Cydonia oblonga) Var, Provence, France, April.

Pascal Pittorino / Mediterranean tree frog (Hyla meridionalis) resting on a Red rose (Rosa sp) in organic garden, Toulon, Var, Provence, France, May.

Gabriel Rojo / White-banded tree-frog (Hypsiboas pulchellus) with Ladybird (Coccinellidae) Calden forest, La Pampa, Argentina

Philippe Clement / Common tree frog (Hyla arborea) sitting on branch covered in lichen at night with full moon, La Brenne, France, May. Digital composite

Nature Production / Japanese tree frog (Hyla japonica) hanging from Pumpkin flower, Japan

Nature Production / Japanese tree frog (Hyla japonica) climbing up onto hydrangea leaf, Fukuoka, Japan, August, sequence 1/3