These are European shags, a species of cormorant, in a canal between the lake La Albufera (in Valencia, Spain) and the Mediterranean sea.
It’s curious that movement they do spreading wings. I saw one of them (the guy of the three photos above this paragraph) spreading and shaking its wings during at least ten minutes, maybe more because was doing it already when I arrived. Sometimes with the wings still, sometimes shaking them slowly and from time to time shaking them frantically.
Maybe to dry their wings after taking a bath.
Or maybe European shags have listened Queen’s song Spread Your Wings, why not?
Photear 
As I understand it, cormorants do not have water repellant oil in their feathers, since they must dive, there fore they dry their feathers with this dance.
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Indeed that must be the reason to do this
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