who's the boss?
The coot to the left is showing an aggressive behaviour in fact it has raised wings. The coot to the right instead is showing a submissive behaviour.
These two birds ended up fighting
https://m.youtube.com/watch?v=YjKWuk1qlPU

The Eurasian coot, also known as the common coot, is a member of the rail and crake bird family, the Rallidae. It is found in Europe, Asia, Australia and parts of Africa.
Similar species: Crane-like Birds
By Tom97
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Uploaded Mar 8, 2015. Captured Mar 8, 2015 17:03 in Parco Fluviale del Tevere, Strada Poggio Basso, 44, 05025 Madonna del Porto TR, Italy.