Yes - species such as Redpoll, Chaffinch and Yellowhammer have been added to
the Australian list as vagrants from Lord Howe Island and Macquarie Island
from the New Zealand populations. LHI is great example of how a population
can be established from an introduced population, with both Blackbirds and
Song Thrush self-introducing from the NZ populations.
Cheers,
Peter
Now a question for the twitchers and the non-twitchers. If a species is
introduced to a place where it becomes established, then an individual
turns
up as a vagrant to Australia, is it 'officially' tickable?
Happy birding
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