Pied-billed Grebes are highly deserving of the “klepto” part of the term kleptoparasitism, especially among their own species. They’re an aggressive and threatening bird, chasing and attacking members of their own species and other birds too.
Although the American Coot is almost exclusively a herbivore it will occasionally make an exception and eat animal matter. They’re also well-known for food thievery (kleptoparasitism) and two days ago this Pied-billed Grebe nearly became one of its victims.