Morley Read / Tropical flat snake (Siphlophis compressus) climbing on a flowering bromeliad (Aechmea) in the Amazon rainforest, Orellana Province, Ecuador. (non-ex)

Morley Read / Slow motion clip of a Linnaeus' sipo snake (Chironius exoletus) with open mouth, part of threat display, Amazon rainforest, Orellana Province, Ecuador. (non-ex)

Morley Read / Parrot snake (Leptophis ahaetulla) threat display, Amazon rainforest, Orellana Province, Ecuador. (non-ex)

Paul Hobson / Parrot snake (Leptophis ahaetulla) in aggressive pose with mouth open. Costa Rica.

Piotr Naskrecki / Banded Tree Snake (Tripanurgos compressus), Costa Rica

Chien Lee / Minden / Black-headed Cat Snake (Boiga nigriceps) swallowing alive Harlequin Flying Tree Frog (Rhacophorus pardalis) prey, Kubah National Park, Sarawak, Malaysia, sequence 1 of 4

Colin Varndell / Grass snake (Natrix natrix) Dorset, UK May

Juan Carlos Munoz / Namib sand snake (Psammophis namibensis) in sand dunes, Swakopmund, Erongo Region, Namibia.

Matthew Maran / Grass snake (Natrix natrix) flicking tongue, Hampstead Heath, London, England, UK, August.

Bence Mate / Satiny Parrot snake (Leptophis depressirostris) Santa Rita, Costa Rica.

Bence Mate / Lowland forest racer (Dendrophidion vinitor) Laguna del Lagarto, Santa Rita, Costa Rica

Luis Quinta / Grass snake (Natrix natrix) juvenile playing dead, Alvao, Portugal, April.