Claus Meyer / Parrot Snake (Leptophis ahaetulla) with mouth open in defense display, Caatinga ecosystem, Brazil

Fabio Pupin / Twig snake, (Thelotornis kirtlandii) standing still among trees, Nyungwe Forest NP, Rwanda, October . Non-ex.

Lucas Bustamante / Twig snake (Thelotornis capensis) with tongue extended, Moremi Game Reserve, Botswana.

Pete Oxford / Vine Snake (Oxybelis brevirostris), Ecuador

Pete Oxford / Vine Snake (Oxybelis brevirostris), Ecuador

Steve O. Taylor (GHF) / Twig snake (Thelotornis) Ruwenzoris Mountain Range, Democratic Republic of the Congo.

Konrad Wothe / Twig Snake (Thelotornis capensis) on rainforest floor, Mahale Mountains National Park, Tanzania, East Africa

ZSSD / Twig Snake (Thelotornis capensis) flicking tongue, native to South Africa, San Diego Zoo, California

ZSSD / Twig Snake (Thelotornis capensis) view of head from above, native to South Africa

ZSSD / Twig Snake (Thelotornis capensis) view of head from above, native to South Africa

Pete Oxford / Vine Snake (Oxybelis brevirostris) aggressive display, Choco rainforest, northwest Ecuador

Michael & Patricia Fogden / Twig Snake (Thelotornis capensis) inflating throat in threat display, South Africa