Diet
These birds feed while swimming, sometimes up-ending or dabbling to reach submerged food. The diet is almost entirely aquatic plants. They will eat both the leaves and stems of submerged and emergent vegetation. They will also dig into muddy substrate underwater to extract roots and tubers. In winter, they may also eat grasses and grains in fields. They will often feed at night as well as by day. Feeding activity, and the birds' weights, often peaks in the spring as they prepare for the breeding season. The young are fed on insects, small fish, fish eggs and small crustaceans along with plants initially, providing additional protein, changing to a vegetation-based diet over the first few months.
Read more about this topic: Trumpeter Swan
Famous quotes containing the word diet:
“Newsmen believe that news is a tacitly acknowledged fourth branch of the federal system. This is why most news about government sounds as if it were federally mandated—serious, bulky and blandly worthwhile, like a high-fiber diet set in type.”
—P.J. (Patrick Jake)
“The pills are a mother, but better,
every color and as good as sour balls.
I’m on a diet from death.”
—Anne Sexton (1928–1974)
“Literary tradition is full of lies about poverty—the jolly beggar, the poor but happy milkmaid, the wholesome diet of porridge, etc.”
—Mason Cooley (b. 1927)