Scaly-sided Merganser Mergus squamatus

Scaly-sided Merganser drake
Scaly-sided Merganser male
The Scaly-sided or Chinese Merganser breeds in the Russian Far East, northern China and North Korea and spends winter in southern China, South Korea, Taiwan and Japan. It is highly endangered by deforestation, pollution, hunting, being out-competed by its relative the Goosander and predated by introduced species such as mink.
Scaly-sided Merganser male and female
Scaly-sided Merganser male in eclipse
Above left is a pair (male and female). Above right is a male in transition to eclipse plumage. The latter has a black back rather than the female's grey but his head has already turned to the brown of the female rather than his breeding plumage of iridescent green-black.
Scaly-sided Merganser pair
Scaly-sided Merganser male with Japanese Black-tailed gull
Scaly-sided Merganser eclipse
The scientific name "squamatus" refers to the pattern of reptilian scales on its sides. (Above centre with Japanese Black-tailed Gull.)
Scaly-sided Merganser male
Scaly-sided Merganser
Scaly-sided Merganser
Like other mergansers, it mainly dives underwater to feed.
Scaly-sided Merganser
Scaly-sided Merganser
Scaly-sided Merganser