Australian Raven

Now you've mentioned that I looked again, at least two of them could be a Pied Currawong but the first and fourth pictures cannot be a Currawong as the bill (beak) is too small relative to the head and the lines of bill and head do not follow. Perhaps there are 3 different birds in the four photos, I will need to look at the originals again, I took a lot more pictures than just these four.