I am always on the look out for snakes. In the garden we have large and small blue tongue lizards.
http://www.outback-australia-travel-secrets.com/blue-tongue-lizard.html
When I was in Victoria, I was working at a hospital when a Tiger snake came inside by crawling under the automatic sliding glass doors.
http://www.tigersnakes.com.au/
It went into the pan cleaning room. We called an expert from the Melbourne zoo who was in the area, he told me that if you measure up about 3 inches from the tail, that is the size of hole that a snake can use to crawl through. Believe it or not this snake found a small hole in the base of a cupboard (kickboard)? & disappeared into there. We believe it then went into the brick wall & escaped. (we hope!)
Also some snakes use drains like a road or highway and can actually climb 3-4 feet in & out of drains. Some are also territorial. Also some snakes are about at night so you watch where you tread and always use a torch or lamp.
When I was working on the paddle steamers on the Murray River around Echuca, I would occasionally have snakes swimming across the river. Also I have a video of an emu swimming as well as a fox.
Even though some people like snakes I am not a fan of them. 4 weeks ago a neighbour lost their pet dog through snake bite. So they are around. Animals tend to investigate a snake, and you dont know about the bite until you visit the vet, usually too late for treatment.
Remember the motto: Tread carefully and carry a big stick. Dont be afraid to turn and walk away.
Regards Andrew at the Sandbar & Mudcrab Railway