Melanie, Vulnerable is the lowest of the legislated threatened categories here.
It goes:
Extinct
Extinct in the Wild
Critically endangered
Endangered
Vulnerable
Near Threatened
Least Concern
If you have any of the top five listings on your land and want to develop, you are in difficulty.
Butterflies are listed in Australia just like vertebrates.
Queensland also has a 'Rare' category that is being phased out with its species being allocated to Near Threatened or Least Concern..