Most oaks around here are evergreens and around early October they drop thousands of acorns. Ducks waddle up from the river to hang out under the trees to wait for a nut to fall and then to swallow them whole. They will do that all day to fatten up for the Winter. They are very cute and I would never harm one, but I will bet that like prosciutto all those acorns would make for a tasty smoked duck.
Another thing that gets swallowed whole are gophers. The egrets come up from fishing and go out in the fields. When they see a gopher move they stab it and toss it in the air and gulp it down.