That looks like a Big moth. The Bobong moth of the Australian alps was an important cultural element for Aboriginal people who would gather in the summer months as the moths appeared in prodigious numbers and were an important food source.
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And what of the snakes? How do you know which might be venemous?
That caterpillar hair reaction certainly looks very disagreeable. I am sure you must have tried a variety of methods to ease the discomfort. What worked best?
Our kitchen sink visitor popped his or her head up a couple of times but hasn't fully reemerged. There used to be a big goanna hang around the entrance at one of Queensland's national parks. I was having a sandwich with cheese in it so offered a piece to the goanna which liked it. I then put a piece of cheese on my finger to hand feed the animal and learned that goannas have very sharp, pin like teeth.
I have now put some pieces of cheese in the sink to try and coax our friend out. And as I was typing the lizard came out for some cheese but back down the hole the moment it saw me.