Head to head
DeKay's Brown Snake vs Eastern Brown Snake
A search for "brown snake" turns up two entirely different animals depending on which continent you're on, and the gap between them could not be wider: one is a small, gentle snake that eats slugs in your garden, the other can kill an adult human.
| DeKay's Brown Snake | Eastern Brown Snake | |
|---|---|---|
| Native range | Eastern and central North America | Australia |
| Venom | Non-venomous | Highly venomous, medically significant |
| Typical length | Under 30 cm | Up to about 2 metres |
| Diet | Earthworms and slugs | Small mammals, birds, other reptiles |
| Temperament | Gentle, rarely bites | Fast, defensive, can be aggressive if cornered |
| Danger to humans | None | One of the most dangerous snakes in the world |
| Family | Colubridae | Elapidae |
| Habitat overlap with people | Common in gardens, high tolerance | Common near farms and towns |
DeKay's Brown Snake vs Eastern Brown Snake: common questions
Are DeKay’s brown snake and the eastern brown snake related at all?
No, despite sharing the common name brown snake, the two are not closely related and belong to entirely separate snake families on different continents. DeKay's brown snake is a member of Colubridae, the largest and generally harmless snake family, native to North America, while the eastern brown snake belongs to Elapidae, the family that also includes cobras and mambas, native to Australia. The shared name reflects only a rough similarity in overall brownish colouration rather than any actual biological connection between the two species.
If I find a small brown snake in my garden, is it dangerous?
The answer depends entirely on where in the world you are. In North America, a small brown snake found in a garden is very likely DeKay's brown snake or a closely related harmless species, posing no danger at all. In Australia, however, a snake matching a similar general description could potentially be a young eastern brown snake, which is genuinely dangerous, so local identification guides or expert advice are strongly recommended for anyone in Australia uncertain about a snake's identity rather than assuming it is harmless based on size or colour alone.
Why do two such different snakes end up with the same common name?
Common names for animals are often assigned independently by people in different regions based on simple, visible traits such as general colour, with little regard for actual taxonomic relationships or global consistency, which is exactly how two unrelated snakes on opposite sides of the world both ended up called brown snake despite being almost nothing alike in danger level, size, or biology. This kind of naming coincidence is common enough across many animal groups that scientific names are generally considered far more reliable for confirming an animal's true identity and relationships.