Spangled Drongo

No, they're actually very smart. : )

I did some research on this for a previous spotting, Daniele! The Australian National University suggests that the slang term comes from a racehorse named Drongo in the early 1920s, who was quite a good horse but who never managed to win a race. "Soon after the horse's retirement it seems that racegoers started to apply the term to horses that were having similarly unlucky careers. Soon after the term became more negative, and was applied also to people who were not so much 'unlucky' as 'hopeless cases', 'no-hopers', and thereafter 'fools'. In the 1940s it was applied to recruits in the Royal Australian Air Force. It has become part of general Australian slang." http://andc.anu.edu.au/australian-words/meanings-origins?field_alphabet_value=91

Thanks Mac, Argy and Kerry. Argy, I didn't actually see the caterpillar - Nath did. He said it was HUGE! And very very green. ; )