This video from the USA says about itself:
3 October 2016
A pair of American Coots feast on algae. Although they gather in very large numbers in south Florida in winter some stay here year round. Coots are not ducks or related to ducks although they spend more time in water than ducks!
The American coot (Fulica americana), also known as a mud hen, is a bird of the family Rallidae. Though commonly mistaken to be ducks, American coots belong to a distinct order. Unlike the webbed feet of ducks, coots have broad, lobed scales on their lower legs and toes that fold back with each step in order to facilitate walking on dry land. Coots live near water, typically inhabiting wetlands and open water bodies in North America. Groups of coots are called covers or rafts. The oldest known coot lived to be 22 years old.