If you are interested in this issue, Belinda Mitterdorfer
studied the magpie hybrid zone and the genetics of it, in about 1997. I am not
sure if she published her results. You could read her honours thesus at
BOZO/ANU. At the Pinnacle each autumn/winter we get white-backed magpies coming
in, presumably dispersing in from further south, but for much of the year there
are mainly black backs.
B. Mitterdorfer
"Microsatellite variation across a hybrid zone in the Australian magpie
Gymnorhina tibicen." Hons.
I have just had a quick look at the article that
Chris cited on the subject (Emu 1976). There also was something similar in a CBN
in the early 1980s (I haven't looked for it now). There is scope to see if
the situation has changed over the years.
Philip
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