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A fair point, however Australia as a continent that gets a
large number of international bird migrants is not so likely to suffer ill
effects from that cause. The bird fauna here has probably long been exposed to
most such nasties. Hawaii, which is a tiny set of isolated islands is in a
different situation, smaller gene pool of virtually all species, so probably
less resistance and - well I don't know - does Hawaii get international bird
migrants?
G'day, Ian.
There is another issue which may be of great
importance in relation the House Crow, which has not yet been
discussed. Exotic disease. Recall that the decline in Hawaiian
birds has been in large part due to the spread of exotic diseases from
exotic pet birds. Do we know how much of a risk this
is?
From my reading it seems that House Crows have
become established in Spain and South Africa, where they have become
environmental 'pests' requiring expensive control programs. (Which does not
include canon netting).
Scott O'Keeffe
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