Ingo Arndt / Prairie Rattlesnake (Crotalus viridis viridis) in defensive posture, South Dakota
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Vincent Grafhorst / Hippopotamus (Hippopotamus amphibius) bull marking territory by flicking dung, Chobe National Park, Botswana
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Franco Banfi / Green anaconda (Eunectes murinus) underwater, flicking tongue, Formoso River, Bonito, Mato Grosso do Sul, Brazil
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Danny Green / 2020VISION / Adder (Vipera berus) basking in the spring sunshine flicking tongue, England, UK, April. Did you know? The Adder is the only venomous snake in the UK.
Rolf Nussbaumer / Western Cottonmouth snake (Agkistrodon piscivorus leucostoma) on lake flicking tongue. Fennessey Ranch, Refugio, Coastal Bend, Texas Coast, USA
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Rolf Nussbaumer / Western Diamondback Rattlesnake (Crotalus atrox) flicking tongue in strike posture, in field of Showy Primrose, Fennessey Ranch, Refugio, Coastal Bend, Texas, USA
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Morley Read / Slow motion clip of a Garden tree boa (Corallus hortulanus) flicking its tongue, Amazon rainforest, Orellana Province, Ecuador. (non-ex)