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Encyclopedia Britannica



MERGANSER

This article appears in Volume V18, Page 164 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: MEC-MIC
MERGANSER , a word due to C. Gesner (Hist. animalium iii. 129) in 1555, and for
long
  used in English as the general name for a group of fish-eating ducks possessing
great
  diving
powers
 , and forming the genus Mergus of Linnaeus, now regarded by ornithologists as a sub-family, Merginae, of the family Anatidae. The mergansers have a
long
 , narrow bill, with a small but evident hook at the tip, and the edges of both mandibles beset by numerous horny denticulations, whence in English the name of saw-bill " is frequently applied to them. Otherwise their structure does not much depart from the Anatine or Fuliguline type. All the species
bear
  a more or less developed crest or tuft on the head. Three of them, Mergus merganser or castor, M. serrator, and M. albellus, are found over the northern parts of the Old World, and of these the first two also inhabit North America, which has besides a fourth species, M. cucullatus, said to have occasionally visited Britain. M. merganser, commonly known as the goosander, is the largest species, being nearly as big as the smaller geese, and the adult male in breeding-attire is a very beautiful bird, conspicuous with his dark glossy-green head,
rich
  salmon-coloured breast, and the upper part of the
body
  and wings black and white. This full plumage is not assumed till the second year, and in the meantime, as well as in the post-nuptial dress, the male much resembles the female, having, like her, a reddish-brown head, the upper parts grey and the lower white. In this
condition
  the bird is often known as the " dun diver." This species breeds abundantly in many parts of Scandinavia, Russia,
Siberia
  and North America, and occasionally in
Scotland
 . M. serrator, commonly called the red-breasted merganser, is a somewhat smaller bird; and, while the fully-dressed male wants the delicate hue of the lower parts, he has a gorget of rufous mottled with black, below which is a patch of white feathers, broadly edged with black. Both these species have the bill and feet of a
bright
  reddish-orange, while the much smaller M. albellus, known as the smew, has these parts of a lead colour, and the breeding plumage of the adult male is white, with quaint crescentic markings of black, and the flanks most beautifully vermiculated.


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