I think this is a Doratifera vulnerans caterpillar - one of the Australian spitfires. They live on eucalyptus leaves. Don't brush against those stingers with bare skin! They burn, stingily...

http://lepidoptera.butterflyhouse.com.au/lima/vulnerans.html

#bushlife
#BlueMountains
#Doratiferavulnerans
#caterpillar
#Australia