Red-tailed Black Cockatoo's

Having been successful last month in getting some cracking pictures of Australia's smallest parrot (Double-eyed Fig Parrot) I have been trying to get some decent pictures of one of its largest the Red-tailed Black Cockatoo. Despite being over 50cm tall they can be remarkably hard to photograph, probably due to their annoying habit of sitting at the tops of trees.
This week the local population of about 18 birds has been feeding voracio...

Sorry minor hiccup in narrative - we are having a bit of a late storm tonight and there has just been an exceedingly loud bang from outside the boys room so I have put on my water proofs and been to investigate and half the guttering has collapsed!

....usly on the Casuarina Pines near the local play park. I have been up there a couple of times but you have to be careful taking pictures around an area where children play - usually try and take our three as cover but still.
I have managed to get decent views of most of the birds and there seems to be at least four full adults with the majority being immature birds.
Most of the time the views you get are similar to this..

looking up from underneath.
This is an immature bird - easily told from the adult by the fact that the red in the tail is actually more yellow and is heavily barred and the birds black feathers are still obviously tipped with white giving it a faint barring effect across its body.
The adults stand out as being very glossy black and their tails are a much deeper red

Not the greatest of pictures but you can at least compare the tails of these two with those of the immatures..

This set were almost good but the shutter speed was not quite fast enough to keep them in focus properly

I will eventually get a picture of one of these in flight that I am happy with...