This bird is a sub-species of one which is found on the the mainland of Australia - the Pied Currawong. This species is called the Lord Howe Island Pied Currawong, or just the Lord Howe Island Currawong.
Its species name is Strepera graculina crissali - which is a bit of a mouthful, the but the first two parts mean "jackdaw-like noisy bird". This clearly comes from the 'crow' like appearance of the bird, and the fact that they are rather vocal.
The LHI subspecies has a larger beak than the mainland bird, but also has a distinctly different voice. They are inquisitive birds and will follow you about. The bird on the log here was making a very good effort to trash the log in search of food, and seemed not to mind as I shuffled along the ground towards it. These pictures were taken in deep shade, so I used a flash which is not common for me.
I think you can tell that these are rather intelligent birds.
You can see pictures of the mainland Pied Currawongs here.
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