Marvin, my pet duck

I saw a wonderful TikTok channel with a lady to refers to a gull as a pet duck.  Since a gull has seemed to take a liking to me, I think I understand where she is coming from.

Marvin will sit outside my home office for hours – looking in. And when he sees I am ignoring him he will do very, very unusual things.  He’ll stand there with one wing raised out for up to ten minutes – and as you can see here, he was just sitting like this:

But on other days, he will not show up at all – sometimes I don’t see him for days at a time.

So doesn’t anyone really know what makes a duck tick?