Edwin Giesbers / RF- European edible frog (Rana esculenta) amongst duckweed, the Netherlands.

Rolf Nussbaumer / RF- Rio Grande leopard frog (Rana berlandieri) pair in duckweed. Texas, USA. (This image may be licensed either as rights managed or royalty free.)

George McCarthy / RF- Grass snake (Natrix natrix), UK. (This image may be licensed either as rights managed or royalty free.)