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    • Viperid Snakes
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Sumatran pit viper (Trimeresurus sumatranus) juvenile on tree trunk, in tropical rainforest. Danum Valley, Sabah, Borneo, Malaysia.
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Nick Garbutt / Sumatran pit viper (Trimeresurus sumatranus) juvenile on tree trunk, in tropical rainforest. Danum Valley, Sabah, Borneo, Malaysia.
Common European adder (Vipera berus) two males fighting over a female. Holt, North Norfolk, England, UK. April
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David Tipling / Common European adder (Vipera berus) two males fighting over a female. Holt, North Norfolk, England, UK. April
Common European adder (Vipera berus) two males fighting over a female, Holt, North Norfolk, England, UK. April
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David Tipling / Common European adder (Vipera berus) two males fighting over a female, Holt, North Norfolk, England, UK. April
Common European adder (Vipera berus) two males fighting over a female, Holt, North Norfolk, England, UK. April.
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David Tipling / Common European adder (Vipera berus) two males fighting over a female, Holt, North Norfolk, England, UK. April.
Meadow viper, (Vipera ursinii), basking in alpine meadow, Apennines, Italy, September . Non-ex.
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Fabio Pupin / Meadow viper, (Vipera ursinii), basking in alpine meadow, Apennines, Italy, September . Non-ex.
Peringuey's desert adder, (Bitis peringueyi), sidewinding on dune, Namib desert, Namibia, February . Non-ex.
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Fabio Pupin / Peringuey's desert adder, (Bitis peringueyi), sidewinding on dune, Namib desert, Namibia, February . Non-ex.
Horned viper (Vipera ammodytes) in natural setting, Turkey.
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Daniel Heuclin / Horned viper (Vipera ammodytes) in natural setting, Turkey.
Two male Southern Pacific rattlesnakes (Crotalus oreganus helleri) fighting during mating season. This behaviour is known as a "combat dance", and is used to determine dominance and the right to mate...
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John Chan / Two male Southern Pacific rattlesnakes (Crotalus oreganus helleri) fighting during mating season. This behaviour is known as a "combat dance", and is used to determine dominance and the right to mate...
Peringuey's adder (Bitis peringueyi) buried in sand,  flicking tongue, hunting, Namib Desert, Namibia.
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Christophe Courteau / Peringuey's adder (Bitis peringueyi) buried in sand, flicking tongue, hunting, Namib Desert, Namibia.
Western rattlesnake (Crotalus viridis viridis), threat display, South Dakota, USA, September.
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Silke Arndt / Western rattlesnake (Crotalus viridis viridis), threat display, South Dakota, USA, September.
Western diamondback rattlesnake (Crotalus atrox), defensive rattling, Arizona, USA, April.
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John Cancalosi / Western diamondback rattlesnake (Crotalus atrox), defensive rattling, Arizona, USA, April.
Group of gravid female Timber rattlesnakes (Crotalus horridus) basking before giving birth, Pennsylvania, USA, July.
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John Cancalosi / Group of gravid female Timber rattlesnakes (Crotalus horridus) basking before giving birth, Pennsylvania, USA, July.