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

Chien Lee / Malayan Slug Snake (Asthenodipsas malaccanus) juvenile, Malaysia

Chien Lee / Oriental Whip Snake (Ahaetulla prasina) juvenile, Danum Valley Field Center, Sabah, Borneo, Malaysia

James Christensen / Andean Snail-eater (Dipsas andiana) female and Land Snail (Drymaeus sp) prey near city, Mindo, Ecuador

James Christensen / Equatorial Mussurana (Clelia equatoriana) snake in rainforest, Septimo Paraiso Cloud Forest Reserve, Mindo, Ecuador

Matthias Breiter / Red-sided Garter Snake (Thamnophis sirtalis parietalis) group mating after hibernation, Narcisse, Manitoba, Canada

James Christensen / Black-naped Forest Racer (Dendrophidion nuchale), Mindo, Ecuador

Sebastian Kennerknecht / San Francisco Garter Snake (Thamnophis sirtalis tetrataenia) on pond vegetation, Pescadero, California

Tim Fitzharris / Common Garter Snake (Thamnophis sirtalis) with extended tongue, very common snake, North America

Michael & Patricia Fogden / Common Egg-eating Snake (Dasypeltis scabra) swallowing egg from another animal's nest, savannah, South Africa

Michael & Patricia Fogden / Common Egg-eating Snake (Dasypeltis scabra) swallowing egg, Africa

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

Michael & Patricia Fogden / Oriental Whip Snake (Ahaetulla prasina) camouflaged among vines in the rainforest, southeast Asia

Heidi & Hans-Juergen Koch / Dione Rat Snake (Elaphe dione) beginning to shed its skin, native to Europe and Asia

Heidi & Hans-Juergen Koch / Colubrid Snake (Elaphe sp) two making initial contact, using tongue (Nasovomeral sense) to identify friend, enemy, or prey

Norbert Wu / Arizona Mountain King Snake (Lampropeltis pyromelana) on branch, Arizona

Mark Moffett / Colubrid Snake (Boiga sp) a flying snake, new species, Tam Dao National Park, Vietnam

Agustin Esmoris / South American Hognose Snake (Xenodon dorbignyi) flicking tongue, Buenos Aires, Argentina

Agustin Esmoris / South American Hognose Snake (Xenodon dorbignyi) flicking tongue, Buenos Aires, Argentina

Piotr Naskrecki / Grass Snake (Natrix natrix), Poland

Chien Lee / Mock Viper (Psammodynastes pulverulentus), Tawau Hills Park, Sabah, Malaysia

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

Chien Lee / Black-headed Cat Snake (Boiga nigriceps) swallowing alive Harlequin Flying Tree Frog (Rhacophorus pardalis) prey, Kubah National Park, Sarawak, Malaysia, sequence 3 of 4

Chien Lee / Madagascar Menarana Snake (Leioheterodon madagascariensis) in forest, Madagascar

Pete Oxford / Stripe-bellied Sand Snake (Psammophis subtaeniatus) with skink prey, Marakele National Park, Limpopo, South Africa

Pete Oxford / Spotted Bush Snake (Philothamnus semivariegatus) juvenile with shed skin, Marakele National Park, Limpopo, South Africa

Paul Bertner / Blunthead Slug Snake (Aplopeltura boa) flicking tongue, Bukit Barisan Selatan National Park, Sumatra, Indonesia

Paul Bertner / Oriental Whip Snake (Ahaetulla prasina) flicking tongue, Cuc Phuong National Park, Vietnam

Paul Bertner / Oriental Whip Snake (Ahaetulla prasina), Mount Isarog National Park, Philippines

Paul Bertner / Green-striped Vine Snake (Philodryas argentea), Yasuni National Park, Ecuador

Thomas Marent / Common False Coral Snake (Erythrolamprus aesculapii), Leticia, Colombia

Thomas Marent / Colubrid Snake (Rhinobothryum bovallii), San Cipriano, Colombia

Steve Gettle / Striped Galapagos Snake (Antillophis steindachneri) swallowing lizard prey, Galapagos Islands, Ecuador

Lorraine Bennery / Colubrid snake (Mimophis mahfalensis) Ankarafantsika National Park, Madagascar, December.

Chien Lee / Painted Mock Viper (Psammodynastes pictus), Tanjung Puting National Park, Central Kalimantan, Borneo, Indonesia

Chien Lee / Malagasy Cat-eyed Snake (Madagascarophis colubrinus), Bekopaka, Madagascar

Nick Garbutt / Colubrid snake (Madagascariophis sp.) endemic to Madagascar eating a small Warty chameleon (Furcifer verrucosus). Transition forest area, Andohahela National Park, southern Madagascar.

Pete Oxford / Halloween Snake (Pliocercus euryzonus), Mashpi Rainforest Biodiversity Reserve, Pichincha, Ecuador

Pete Oxford / Mimic False Coral Snake (Erythrolamprus mimus micrurus), Mashpi Rainforest Biodiversity Reserve, Pichincha, Ecuador

Pete Oxford / Mimic False Coral Snake (Erythrolamprus mimus micrurus), Mashpi Rainforest Biodiversity Reserve, Pichincha, Ecuador

Pete Oxford / Mimic False Coral Snake (Erythrolamprus mimus micrurus), Mashpi Rainforest Biodiversity Reserve, Pichincha, Ecuador

Pete Oxford / Andean Snail-eater (Dipsas andiana), Mashpi Rainforest Biodiversity Reserve, Pichincha, Ecuador

Jim Brandenburg / Plains Garter Snake (Thamnophis radix) swimming over White-tailed Deer (Odocoileus virginianus) skull in rainfall, Minnesota

Chien Lee / Mangrove Cat Snake (Boiga dendrophila), Kuching, Sarawak, Borneo, Malaysia

Chien Lee / Common Wolf Snake (Lycodon capucinus), Black River Gorges National Park, Mauritius

Chien Lee / Malagasy Cat-eyed Snake (Madagascarophis colubrinus), Masoala National Park, Antsiranana, Madagascar

Chien Lee / Wolf Snake (Stegonotus sp), Papua, Indonesia

Ingo Arndt / Cornsnake (Elaphe guttata), Everglades National Park, Florida

Pete Oxford / Vine Snake (Oxybelis brevirostris), Ecuador

Pete Oxford / Vine Snake (Oxybelis brevirostris), Ecuador

James Christensen / Puget Sound Garter Snake (Thamnophis sirtalis pickeringii), Olympic National Park, Washington

James Christensen / Large-scaled Black Tree Snake (Chironius grandisquamis) in defensive posture, Mindo, Ecuador

Chien Lee / Twin-barred Tree Snake (Chrysopelea pelias) juvenile, Malaysia

Chien Lee / Sabah Keelback (Amphiesma flavifrons) snake, Danum Valley Field Center, Sabah, Borneo, Malaysia

Chien Lee / Black-headed Cat Snake (Boiga nigriceps), Danum Valley Field Center, Sabah, Borneo, Malaysia

Chien Lee / Blunthead Slug Snake (Aplopeltura boa), Danum Valley Field Center, Sabah, Borneo, Malaysia

Konrad Wothe / Puffing Snake (Pseustes poecilonotus), Panguana Nature Reserve, Peru

Konrad Wothe / Velvet Swampsnake (Erythrolamprus typhlus), Panguana Nature Reserve, Peru

Konrad Wothe / Green Vine Snake (Oxybelis fulgidus) flicking tongue, Panguana Nature Reserve, Peru

Thomas Marent / Longnose Whipsnake (Ahaetulla nasuta) in defensive posture, Agumbe Rainforest Research Station, Western Ghats, India

Thomas Marent / Longnose Whipsnake (Ahaetulla nasuta) in defensive posture, Agumbe Rainforest Research Station, Western Ghats, India

James Christensen / Andean Snail-eater (Dipsas andiana) female and young, Mindo, Ecuador

James Christensen / Spotted Genuine-Snake (Saphenophis boursieri) waving tail in defensive display, Hacienda San Vicente, Mindo, Ecuador

Chien Lee / California Glossy Snake (Arizona elegans occidentalis), San Felipe, Baja California, Mexico

Chien Lee / Brown Tree Snake (Boiga irregularis) juvenile, Mamberamo Basin, Dabra, Indonesia

Chien Lee / White-spotted Cat Snake (Boiga drapiezii) camouflaged against leaf litter, Danum Valley Field Centre, Borneo, Malaysia

Chien Lee / Dog-toothed Cat Snake (Boiga cynodon) a predator with exceptionally long teeth adapted for fast penetration through layers of bird feathers, Mulu National Park, Malaysia

Chien Lee / Brown Tree Snake (Boiga irregularis), Weda Bay, Halmahera, Sulawesi, Indonesia

Pete Oxford / Tropical Rat Snake (Spilotes pullatus) in defensive posture, native to South America

Pete Oxford / Tropical Rat Snake (Spilotes pullatus) in defensive posture, native to South America

Pete Oxford / Milk Snake (Lampropeltis triangulum micropholis), native to South America

Pete Oxford / Milk Snake (Lampropeltis triangulum micropholis), native to South America

Pete Oxford / Milk Snake (Lampropeltis triangulum micropholis), native to South America

Pete Oxford / Common Garter Snake (Thamnophis sirtalis), Georgia

Pete Oxford / Southern Pinesnake (Pituophis melanoleucus mugitus) on road, Orianne Indigo Snake Preserve, Georgia

Pete Oxford / Southern Pinesnake (Pituophis melanoleucus mugitus) in forest, Orianne Indigo Snake Preserve, Georgia

Pete Oxford / Eastern Indigo Snake (Drymarchon corais couperi) basking on shore, Orianne Indigo Snake Preserve, Georgia

Pete Oxford / Eastern Indigo Snake (Drymarchon corais couperi), Orianne Indigo Snake Preserve, Georgia

Pete Oxford / Eastern Indigo Snake (Drymarchon corais couperi) in forest, Orianne Indigo Snake Preserve, Georgia

Pete Oxford / Eastern Indigo Snake (Drymarchon corais couperi) leaving burrow, Orianne Indigo Snake Preserve, Georgia

Pete Oxford / Eastern Indigo Snake (Drymarchon corais couperi) leaving burrow, Orianne Indigo Snake Preserve, Georgia

Pete Oxford / Eastern Kingsnake (Lampropeltis getula), Little Saint Simon's Island, Georgia

Pete Oxford / Cornsnake (Elaphe guttata) climbing up tree, Little Saint Simon's Island, Georgia

Pete Oxford / Coachwhip (Masticophis flagellum) in defensive posture, Little Saint Simon's Island, Georgia

Pete Oxford / Coachwhip (Masticophis flagellum) flicking tongue, Little Saint Simon's Island, Georgia

Pete Oxford / Coachwhip (Masticophis flagellum), Little Saint Simon's Island, Georgia

Pete Oxford / Milk Snake (Lampropeltis triangulum) on tree bark, Georgia

Pete Oxford / Indigo Snake (Drymarchon corais) on sand dunes, Georgia

Pete Oxford / Indigo Snake (Drymarchon corais) on sand dunes, Georgia

Pete Oxford / Yellow Rat Snake (Elaphe obsoleta quadrivittata) in defensive posture, Little Saint Simon's Island, Georgia

Pete Oxford / Rough Green Snake (Opheodrys aestivus), Little Saint Simon's Island, Georgia

Pete Oxford / Louisiana Pinesnake (Pituophis ruthveni) in defensive posture, Orianne Indigo Snake Preserve, Georgia

Pete Oxford / Indigo Snake (Drymarchon corais) flicking tongue, Georgia

Pete Oxford / Louisiana Pinesnake (Pituophis ruthveni) held by girl, Orianne Indigo Snake Preserve, Georgia

Duncan Usher / Dice Snake (Natrix tessellata) swimming in lake with fish prey, Bulgaria