How to Identify the Fer-de-lance (Identification Guide)
The fer-de-lance is a slender, alert Central and South American pit viper marked by dark, triangular side blotches and a distinctly pointed snout.
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Key identifying features
The fer-de-lance is recognized by its somewhat elongated, pointed snout, large triangular head clearly distinct from a narrower neck, and a series of dark, triangular or diamond-shaped blotches along the sides that often appear as alternating dark and light patches when viewed from above. It is more slender and quicker-moving than many other large pit vipers.
Coloration & pattern
Base coloration ranges from gray, olive, and tan to reddish-brown, marked with a row of dark, triangular blotches along each side that sometimes meet at the spine to form X or diamond shapes. A dark, pale-edged stripe often runs from the eye to the corner of the jaw, and the belly is typically pale with dark speckling or blotches.
Head, eyes & scales
The head is large, triangular, and arrow-shaped, clearly wider than the neck, with heat-sensing pits between the eye and nostril. The snout is somewhat pointed and slightly upturned compared to many other pit vipers. Scales are keeled, giving a moderately rough texture.
Size & body shape
Adults typically range from 4 to 6 feet, with females generally larger than males, and a moderately slender, agile build compared to the notably bulkier bushmaster. The tail is relatively short and tapers to a point without a rattle.
Range & habitat where you'll see it
Fer-de-lance snakes are found in a wide range of habitats across Central and northern South America, including forest edges, agricultural land, and areas near human settlement, often near water sources, and are known for being active both day and night.
How to tell it apart from look-alikes
The fer-de-lance's more slender build, pointed snout, and triangular side blotches distinguish it from the bulkier, coarser-scaled bushmaster found in overlapping range. Its lack of a rattle separates it from unrelated rattlesnake species, and its heat-sensing facial pits and triangular head distinguish it from non-venomous colubrid snakes of similar color found in the same habitats.
Frequently asked questions
What snout shape helps identify a fer-de-lance?
A somewhat elongated, slightly upturned, pointed snout, distinct from the blunter snouts of many other pit vipers.
What pattern is typical of the fer-de-lance?
A row of dark triangular or diamond-shaped blotches along each side, sometimes meeting at the spine to form X shapes.
How does the fer-de-lance differ from the bushmaster?
It is more slender with a pointed snout and finer scales, while the bushmaster is bulkier with much coarser, rougher keeled scales.
Does the fer-de-lance have a rattle?
No, its tail simply tapers to a point without any rattle structure, unlike rattlesnakes.
Fer-de-lance identified by the community
Recent Fer-de-lance specimens identified with Snake Identifier.
