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There will be someone out there who knows much more about
this, but my belief is that seed-eating birds (and the superbs, corellas
etc are clearly eating the seed of the acacia) digest the seed
and therefore do not spread it. On the other hand birds like
currawongs, blackbirds that swallow the fruit will excrete viable seeds of
eg pyracantha, cotoneaster, boxthorn, blackberries, briars. HANZAB
cites reports of superbs eating some berries eg of exocarpos, and I suppose they
could excrete viable seeds of those. I have seen superbs feeding on
small black cherries (produced from the stock plants of a derelict orchard)
and, with their crimson-stained faces, I thought they were taking the
flesh and discarding the stone, but I am not certain of that. Of
course, SCCs and YTBCs will carry cones of radiata pine, cedars etc some
distances in their bills. .
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