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Look for a distinct dark zigzag running down the snake’s back: it is the clearest usual sign of an adder. Colour alone is unreliable, because adders can be grey, brownish or black. In the UK, the NHS identifies three wild snake types, and the adder is the only venomous one. Keep your distance rather than approaching or handling a snake to check its features.
How to identify an adder
Start with the pattern along the back. An adder usually has a dark, distinct zigzag, and may also show a V- or X-shaped marking on its head. Its eye is often described as red, and its pupil is slit-shaped, but do not get close to inspect either feature.
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Colour varies: males are often silvery-grey, while females may be lighter or reddish-brown. Black, or melanistic, adders also occur, so a dark or black snake cannot be ruled out as an adder simply because the zigzag is hard to see. The Wildlife Trusts gives a typical adder length of around 60–80 cm; length is only a supporting clue, not a reliable identification on its own.
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How to tell an adder from a grass snake or smooth snake
The UK’s three wild snake types are the adder, grass snake and smooth snake. Compare several visible features from a safe distance rather than relying on one colour or the place where the snake was seen.
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| Species | Useful visible clues | Reported length | Context |
|---|---|---|---|
| Adder | Usually a distinct dark back zigzag; colour varies, and black forms occur. | Around 60–80 cm typical length, according to The Wildlife Trusts; publication year not stated. | The UK’s only venomous wild snake, according to the NHS. |
| Grass snake | Usually a yellow-and-black collar behind the head, pale belly and dark marks along the sides. | Up to 150 cm, according to The Wildlife Trusts; publication year not stated. | Harmless to humans, according to The Wildlife Trusts. |
| Smooth snake | Slender body, round pupil and a less well-defined dark back pattern than an adder. | Around 60–70 cm, according to The Wildlife Trusts; publication year not stated. | Rare in the UK and limited to a few heathland sites, according to The Wildlife Trusts. |
Adder versus grass snake
A grass snake’s yellow-and-black collar and dark side markings are useful clues; an adder is more strongly marked by a zigzag along its back. Grass snakes can grow longer than adders, but size overlaps are possible and a snake’s length is difficult to judge in the field. Do not approach to look for a collar or compare measurements.
Adder versus smooth snake
Smooth snakes can resemble adders, but are described as more slender, with round pupils and less clearly formed dark back markings. They are usually grey or dark brown. A grey or brown colour by itself does not establish that a snake is an adder.
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Use a safe identification checklist
- From where you are, look for the overall back pattern: a distinct zigzag is a usual adder clue.
- Check whether a yellow-and-black collar and dark side markings are visible, which are characteristic clues for a grass snake.
- Consider body build and pattern together; smooth snakes are more slender and have less-defined back markings.
- Treat colour, habitat and location as supporting context only. None is enough by itself to confirm a species.
- If the features are unclear, leave the snake alone rather than moving closer. The cited identification guides do not provide a validated scoring method for uncertain sightings.
What to do if you encounter or are bitten by a snake
The NHS advises: “do not go near the snake, or try to catch or kill it”. Do not handle a snake to identify it. If you can take a photo or note its appearance without approaching it, that information may help clinicians if a bite occurs.
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If bitten, get medical attention as soon as possible. NHS guidance also says not to try to suck or cut venom out, tie anything tightly around the bitten area, or take aspirin or ibuprofen. Do not delay care because you think the snake was unlikely to be dangerous.
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