I'd say it's a [Cormorant](https://www.birdguides.com/articles/identification/great-and-double-crested-cormorants-and-european-shag-photo-id-guide/) (but I am open to being corrected).
The common cormorant (or shag)
Lays eggs inside a paper bag,
The reason you will see no doubt,
Is to keep the lightning out.
But what these unobservant birds
Have failed to notice is that herds
Of wandering bears may come with buns
And steal the bags to hold the crumbs.
*Christopher Isherwood*
Looks like a not quite full grown cormorant, which are pretty much black as adults.
If you think seagulls can poop, you've never seen a cormorant go at it!
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