Winter Black-Cockatoos, Melbourne (Vict.)

["Karen" <>]

I've been seeing flocks of up to forty YTBCs fly over Warrandyte South, 
which is on the Yarra River corridor, most late afternoons for a couple of 
weeks.  Usually they are just noisily cruising along but last week I noticed 
a flock passing by at a noticeably high speed (for YTs).  Not sure what the 
hurry was.
Cheers,
Karen
Warrandyte South.