.............snakes.
This one gave us just a frisson of nerves beside our pool on holiday the other week. Luckily it's a harmless tree snake who, with its mate, seemed to live inside a rock wall beside the swimming pool. One member of our family was not seen anywhere near the pool after this sighting. Let's just say that, if we were to have been bitten, medical help would not have been close by!!
Elder daughter saw the back end of a snake disappearing in one of our garden beds last weekend - judging by the description either a tiger or brown snake - both of which are extrememly venomous.