Mostly stems, leaves, and seeds of water plants such as pondweeds, duckweed, and duck potato. The trumpeter swan is the largest of all North American birds. There are few left in North America, but their numbers are slowly increasing. Woodlands near open areas, particularly places with dead trees. Flickers and starlings often fight over the same cavity in a tree.
Starlings usually win and take over the nest.
Lakes, rivers, and wetlands in U.S. and Canada. Frogs, fish, crayfish, and other invertebrates. The piping plover is very rare. Their nesting places have been taken over by people. Central and southern U.S. in lakes, rivers, and wetlands.