Ducks profit from diving coot, video

This video is by Bert Verbruggen from Noord Brabant province in the Netherlands.

He writes about it (translated):

Along the Maxima canal in ‘s-Hertogenbosch there are at least 10 couples of gadwall ducks. What is striking here is that they are always close to a coot. The coot is used to dive for [water] plants,

which the ducks cannot do themselves

and the gadwalls make good use of leftovers. Is this not optimal use of food?

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