Look, don't approach
Use this guide to understand possibilities, never to decide that an unknown snake is safe. Natural variation, juveniles, shadows and distance can defeat photo identification.
THE SAFE IDENTIFICATION RULE
Do not touch, trap, corner or kill it. Move people and pets away. A photo only helps when it already exists or can be taken with zoom from a genuinely safe place.
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Highly venomous
Pseudonaja textilis
Venomous
Pseudechis porphyriacus
Non-venomous
Morelia spilota spilota
SMALLER SPECIES / EASY TO MISREAD
Slender, fast and day-active; colour can range through grey, olive or brown, usually with dark facial markings edged by paler scales.
Lookalike warning: Often confused with an eastern brown snake, particularly during a brief garden sighting.
Australian Museum species page ↗A small, mostly nocturnal forest snake with a pale marking over the head and neck. It may flatten its neck or raise the front of its body when defensive.
Lookalike warning: The crown may be incomplete, obscured or invisible in a poor photograph; posture is not an identification test.
Australian Museum species page ↗Small, smooth and cylindrical with a blunt head and tail. It is often found after rain, digging or garden work and can resemble a large earthworm.
Lookalike warning: A tiny snake should still be left alone. Size and a worm-like shape are not reasons to pick it up.
Australian Museum species page ↗WHY A PHOTO CAN FAIL
Juveniles can look different from adults. A phone camera can shift colour, flatten pattern and hide scale detail. The head may be obscured, the body may be partly concealed, and more than one species can share the same general colour or build.
Location and habitat narrow possibilities but do not prove an identification. Sydney contains more snake diversity than the six examples on this page, and snakes can travel through habitat that does not look typical.
For a safety decision, the useful facts are the last known position, direction of travel, whether it is inside or outside, and whether people or pets can be kept away.
Species descriptions are paraphrased from the linked Australian Museum profiles. General safety is checked against NSW Environment guidance ↗. Public photographs and full licence details appear on the sources and photo credits page.
