Another why is it not green?

I ran my Moth Trap on the night of 17th February. No Moths turned up but when my good wife, Bron, did her usual check of the surrounding vegetation near the trap, she found this beautiful specimen. It is the Green Shieldbug or Palomena prasina.

What is interesting about this bug is that the adult changes colour to a dark reddish-brown in winter, as shown by this picture, returning to green again in spring.

There are now pictures of this critter on this site showing summer adult, winter adult and larvae hatching.