Shirley Cook wrote:
 
Dear all,
 The problem of Pied Currawongs spreading seeds is a huge one in the 
Northern Tablelands and particularly around Armidale where there are 
many privets, hawthorns, cotoneasters and pyracanthas.  The privet in 
particular comes up everywhere and in some of the paddocks outside the 
city there are hundreds of hawthorn bushes.  The Currawongs themselves 
are a major problem staying around and breeding up in large numbers.  
From time to time the council has a blitz on the privet but the other 
berry-producers remain a major contributor to the large Pied Currawong 
population that stays around all year.
  Agree with Shirley. But here in Gloucester (NSW north and inland of 
Newcastle)  the problem is privet and Camphor Laurels which also give us 
large flocks of King Parrots, White-headed and Topknot Pigeons (very 
acceptable).
 Every winter a huge flock of Currawongs arrives in May, and stays till 
September. Their arrival each year gives the resident flocks of Little 
Ravens a very uncomfortable time while the status-quo is sorted out.  I 
haven't kept accurate records of number of Currawongs but last year 
counted around 150 flying in one morning from the hills around to 
rendezvous in the Gloucester Park area along the river.
 We have a problem with too many Little Ravens around Stratford and 
Craven where a greyhound breeder leaves out the remains of cattle 
carcases which he collects to feed his hounds. Yuck..... And they stay 
all year.
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