Tailed Emperor Butterfly

A few days ago Anne noticed a chrysalis  (or pupa) on an agapanthus plant underneath a frangipani.  We snipped a section of leaf that held it and placed it into  container.  Today it hatched into a very spectacular butterfly :

It is a Tailed Emperor or Polyura pyrrhus

ref : http://www.brisbaneinsects.com/brisbane_nymphs/TailedEmperor.htm

The above site has, as usual, a good description and details.

I'm not sure what it had been feeding on, but it is more than welcome in our yard anytime. I haven't noticed this species around before.