Diet & feeding
Dives for seeds, roots, insect larvae and small fish.
Habitat
Lakes, reservoirs and gravel pits; large flocks gather on estuaries and sheltered coasts in winter.
Breeding
A scarce UK breeder; most seen here are winter visitors from Russia and northern Europe.
Migration
Strong winter influx boosts UK numbers tenfold.
Vocalisation
Males whistle during display; females give a growling "krr".