- Trumpeter Swan Benefits Mallards
- Trumpeter Swans can more easily pull vegetation up from deeper areas in the pond than the Mallards can.
- So the Mallards will concentrate around the swan to feed on the vegetation pulled up by the swan.
- This older publication seems to explain well what goes on between swans and other waterfowl such as Mallards
- In this video notice how the swan moves its feet up and down — this creates an upwelling that helps bring vegetation closer to the water surface.
- This swan is not too happy about the mallards taking advantage of it.
