Two Swans a Swimming, Bartlett Pond, White Horse Beach, Manomet, Plymouth, Massachusetts, USA

Although it's cold water, the melting ice means the tender underwater shoots are available for eating.

Still, there is a lot of ice in the shallow end of the pond where food would normally be more plentiful and accessible.

I have sometimes complained about having to go to the climate-controlled supermarket to get food. Instead, if I imagine having to stick my head underwater in winter just to eat cold, waterlogged plants to survive, perhaps that will end my complaints.