Notes: Large. Broad orange-brown breast-band separates
black head from dark body. Male head glossed w. green, bordered below
by narrow white collar. Female smaller; white around the eye & bill.
All show white wing coverts, dark primaries & irredescent green secondaries
during flight. Juvenile like female but browner head, neck collar
ill-defined, some whitish feathering between bill & eye. On lakes in
fairly open country. Scatter to breed winter/spring, often in farmland.