The Goosander

Can you recognise at a glance which is the female? The female goosander has a brown head and a grey and white body, while the male has a dark green head and a black and white body.
The goosander is not a duck but a fish-eating aquatic bird. It is an iconic species in Haute-Savoie, as it breeds in only 5 provinces in France. It is a good diver and it nests in cavities, such as old tree trunks.