Claudio Contreras / Fer de lance / Central american lancehead (Bothrops asper) in defense posture, Montes Azules Biosphere Reserve, Lacandon Rainforest, Mexico, September

James Christensen / Fer-de-lance (Bothrops asper) juvenile coiled on forest floor, Colon, Panama

James Christensen / Fer-de-lance (Bothrops asper) resting in limestone cave, Panama

Martin van Lokven / Fer-de-lance (Bothrops asper), venomous, Laguna del Lagarto, Boca Tapada, Costa Rica

Martin van Lokven / Fer-de-lance (Bothrops asper), venomous, Laguna del Lagarto, Boca Tapada, Costa Rica

James Christensen / Fer-de-lance (Bothrops asper) juvenile, venomous, Panama

James Christensen / Fer-de-lance (Bothrops asper) juvenile, venomous, Panama

James Christensen / Fer-de-lance (Bothrops asper) young, venomous, Panama

James Christensen / Fer-de-lance (Bothrops asper) in defensive posture, venomous, Panama

James Christensen / Fer-de-lance (Bothrops asper) in defensive posture, venomous, Panama

James Christensen / Fer-de-lance (Bothrops asper) in defensive posture, venomous, Panama

Nick Gordon / Giant tarantula (Theraphosa leblondi) eating Fer de lance snake (Bothrops asper) Venezuela

Nick Gordon / Fer de Lance / Lancehead snake {Bothrops asper} in rainforest, Amazonia, Brazil

Doug Wechsler / Fer de lance snake on leaf litter {Bothrops asper} captive

Pete Oxford / Fer de lance snake {Bothrops asper} Esmereldas, Ecuador

TIM MARTIN / Central america lancehead snake / Fer de lance {Bothrops asper} Atlantic rainforest, Costa Rica

Staffan Widstrand / Fer-de-lance snake {Bothrops asper} beside boots, Guyana

Michael & Patricia Fogden / Fer-de-lance (Bothrops asper) snake, swallowing Whiptail Lizard, rainforest, Costa Rica

Michael & Patricia Fogden / Fer-de-lance (Bothrops asper) snake, hunting in the rainforest at night, Costa Rica

Michael & Patricia Fogden / Fer-de-lance (Bothrops asper) snake, juvenile swallowing Rain Frog (Eleutherodactylus sp) rainforest, Costa Rica

Michael & Patricia Fogden / Fer-de-lance (Bothrops asper) snake, juvenile swallowing Rain Frog (Eleutherodactylus sp) in the rainforest, Costa Rica

Michael & Patricia Fogden / Fer-de-lance (Bothrops asper) snake, juvenile swallowing Rain Frog (Eleutherodactylus sp) in the rainforest, Costa Rica

Michael & Patricia Fogden / Fer-de-lance (Bothrops asper) snake, two meters long, venomous, coiled on rainforest floor, Costa Rica

Michael & Patricia Fogden / Fer-de-lance (Bothrops asper) snake, venomous snake coiled on palm leaf in rainforest, Costa Rica

Pete Oxford / Fer de lance (Bothrops asper) yellow morph. West Ecuador, South America

Pete Oxford / Fer de lance snake {Bothrops asper} Ecuador, South America

TIM MARTIN / Fer de lance snake on rainforest floor, Costa Rica

Pete Oxford / Fer de Lance Snake showing tail {Bothrops asper} West Ecuador

Phil Savoie / Fer de lance snake / Central american lancehead {Bothrops asper} Costa Rica

Phil Savoie / Fer de lance camouflaged in leaf litter {Bothrops asper} Monteverde, Costa Rica