This species is the Black Currawong - and it only occurs in Tasmania. It goes by the name of Strepera fuliginosa which means 'sooty noisy bird' which is as good a description as I could give it. At about 47 -49 cm long these are impressive birds to see close at hand.
(For those of you with an eye for detail, you will notice that this is the second bird this year with a specific name of fuliginosa - last week's Sotty Oystercatcher having the same specific name).
I am sure these birds were used to receiving handouts from tourists as they would often sit on the window ledges of our cabin and stare inside, skewering us with those intense yellow eyes!
One of these birds has a deformed beak, and I think that you can tell that his (her?) plumage looks a little less well cared for that the first bird. Maybe that 'extension' prevents it from preening properly.
If you have a look at the second picture of the bird with the 'extra beak' I think you can see that the lower mandible is damaged - this web site by the BTO suggests this may be the cause of the strange growth of the upper one.
Now it's your turn - click the blue button below and off you go!