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They are native but disappeared and were re introduced in the 80’s
They are now thriving so much they are trying to control them, destroying nests etc...
Hamilton harbour has literally hundreds..

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Oh, I didn't realize they were re-introduced. I was shown 3 sitting on a branch on Manitoulin Island. Several years later, there were 10s of thousands and talk of a cull. After the zebra mussels moved in and made the clear water even clearer, the cormorants were accused of eating all the small fish that could be seen. Fishing was lousy for some time after that and then the cormorants moved out and it's finally rebounding. We wondered where they had gone.