Franco Banfi / Close view of a Green anaconda, (Eunectes murinus) underwater, Formoso River, Bonito, Mato Grosso do Sul, Brazil
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Lucas Bustamante / Red tailed boa constrictor (Boa constrictor constrictor) juvenile, portrait, with tail wrapped round head, Cuayabeno, Sucumbios, Ecuador.
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Luciano Candisani / Green Anaconda (Eunectes murinus) female constricting male after copulation, after which she will consume him, Brazil
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Nick Garbutt / Yellow Anaconda (Eunectes notaeus) in vegetation at the edge of the Paraguay River, Taiama Reserve, western Pantanal, Brazil, South America.
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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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Franco Banfi / Green anaconda (Eunectes murinus) swimming inFormoso River, Bonito, Mato Grosso do Sul, Brazil
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Chris Mattison,Chris Mattison / Rubber Boa (Charina bottae) in defensive posture, raising tail to mimic head. California, USA, November.
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Daniel Heuclin / Dumeril's Ground Boa (Acrantophis dumerili) against white background. Endemic to Madagascar.
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Pete Oxford / Common Tree Boa (Corallus hortulanus) coiled around branch, Iwokrama Rainforest Reserve, Guyana, manipulated image
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Pete Oxford / Common Tree Boa (Corallus hortulanus) climbing in tree, Iwokrama Rainforest Reserve, Guyana, manipulated image
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Pete Oxford / Common Tree Boa (Corallus hortulanus) wrapped around branch, Iwokrama Rainforest Reserve, Guyana, manipulated image
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Pete Oxford / Emerald Tree Boa (Corallus caninus) showing thermoreceptors between the labial scales, Amazon, Ecuador