Thanks guys.
Adam - I found the fly on
http://brisbaneinsects.com and it turns out it's a treehopper mimic fly:
http://www.brisbaneinsects.com/brisb...kingFly%20.htm The theory is that if the look like a prey that is extremely fast to get away, the predators don't bother going after them. Personally, I'd just rather be that fast to get away. ie I'd rather be able to run as fast as Usain Bolt rather than just look like him but run as slow as a wet wig
