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Colibri?

Actually I am sure this is a Little Black Cormorant but I could not find any information on the blue skin under its beak. I suppose this is a breeding bird but why none of the books or websites I consulted mentions this blue colour as a breeding sign?

I posted this question on Australian Bird Identification FB page yesterday but no comments so far. I wonder if somebody please may shed more light on this blue colouring?

Or is this something that every Australian child knows and I shouldn't be asking? (-;

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Uploaded on October 28, 2022
Taken on October 25, 2022