Followed up on Anthony Katon's posting on his seeing 4 Apostlebirds at
Eastern Creek Lawn Cemetery, Sydney on Tuesday. We saw 27 birds today, in
groups of 9, 9, 7 and 2.
Given that others have reported seeing Apostlebirds within a few kilometres
of the cemetery in recent years, at Doonside and Australia's Wonderland, and
the number of birds we saw, it seems reasonable to assume that, currently,
there is a resident breeding population in Sydney.
Sydney is, of course, outside the Apostlebird's normal range, which
suggests that these birds are most likely to be descendants of local captive
birds which escaped or were released.
Obviously, this isn't the first time that birds have colonised an area in
this way. Presuming that they continue to survive here, can someone
enlighten me on the process by which it is decided that Sydney has become an
extension of the Apostlebird's normal range?
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