﻿84 
  NOKTH 
  AMERICAN 
  DUCKS, 
  GEESE, 
  AND 
  SWANS. 
  

  

  the 
  range, 
  while 
  the 
  bulk 
  move 
  south 
  to 
  central 
  Argentina 
  to 
  breed, 
  

   and 
  retire 
  to 
  northern 
  Argentina 
  to 
  spend 
  the 
  colder 
  . 
  portion 
  of 
  the 
  

   year. 
  The 
  greater 
  part 
  of 
  the 
  species 
  is, 
  therefore, 
  confined 
  to 
  the 
  

   immediate 
  vicinit} 
  T 
  of 
  the 
  Rio 
  de 
  La 
  Plata 
  and 
  the 
  lower 
  valleys 
  of 
  its 
  

   larger 
  branches 
  in 
  a 
  district 
  approximate^ 
  700 
  miles 
  in 
  length 
  north 
  

   and 
  south, 
  and 
  scarcely 
  half 
  that 
  in 
  width. 
  This 
  same 
  species 
  is 
  

   found 
  also 
  in 
  southern 
  Africa 
  and 
  southern 
  Asia. 
  

  

  [Dendrocygna 
  viduata 
  (Linn.). 
  White-faced 
  Tree-duck. 
  

  

  ; 
  This 
  species 
  does 
  not 
  come 
  north 
  to 
  the 
  United 
  States, 
  but 
  has 
  occurred 
  as 
  a 
  strag- 
  

   gler 
  in 
  Cuba 
  (three 
  records) 
  and 
  in 
  Barbados 
  (one 
  flock). 
  Its 
  regular 
  range 
  is 
  from 
  

   Central 
  Colombia 
  and 
  northeastern 
  South 
  America 
  to 
  Peru, 
  Bolivia, 
  and 
  Paraguay; 
  

   less 
  common 
  in 
  Argentina, 
  south 
  to 
  Buenos 
  Aires. 
  It 
  seems 
  to 
  perform 
  no 
  regular 
  

   migration 
  in 
  any 
  part 
  of 
  its 
  range. 
  

  

  The 
  same 
  species, 
  or 
  one 
  so 
  closely 
  allied 
  that 
  it 
  has 
  not 
  yet 
  been 
  separated, 
  inhab- 
  

   its 
  much 
  of 
  Africa 
  from 
  ocean 
  to 
  ocean, 
  and 
  from 
  about 
  15° 
  north 
  latitude 
  (Senegal) 
  

   to 
  27° 
  south 
  latitude 
  (Potchefstroom); 
  also 
  the 
  island 
  of 
  Madagascar. 
  Its 
  range 
  in 
  

   Africa, 
  therefore, 
  is 
  more 
  extensive 
  than 
  in 
  South 
  America, 
  and 
  on 
  the 
  whole 
  is 
  in 
  

   about 
  the 
  same 
  latitude, 
  for 
  the 
  range 
  in 
  South 
  America 
  extends 
  from 
  latitude 
  11° 
  

   X. 
  to 
  latitude 
  34° 
  S.] 
  

  

  [Dendrocygna 
  arborea 
  (Linn.).» 
  Whistling 
  Duck. 
  

  

  This 
  dues 
  is 
  known 
  only 
  from 
  the 
  West 
  Indies, 
  where 
  it 
  ranges 
  from 
  Andros 
  

   Island, 
  Bahamas, 
  through 
  all 
  the 
  Greater 
  Antilles 
  to 
  St. 
  Croix, 
  Virgin 
  Gorda, 
  and 
  

   Barbados 
  of 
  the 
  Lesser 
  Antilles; 
  said 
  to 
  be 
  a 
  migrant, 
  but 
  the 
  available 
  data 
  do 
  not 
  

   suffice 
  to 
  trace 
  its 
  movements.] 
  

  

  [Dendrocygna 
  discolor 
  (Scl. 
  & 
  Salv.). 
  Southern 
  Red-billed 
  Tree-duck. 
  

  

  This 
  duck 
  ranges 
  north 
  to 
  the 
  island 
  of 
  Trinidad 
  and 
  to 
  Davila, 
  Panama. 
  It 
  is 
  of 
  

   wide 
  distribution 
  in 
  northern 
  South 
  America 
  from 
  Colombia 
  to 
  Guiana 
  and 
  south 
  to 
  

   eastern 
  Peru 
  and 
  northern 
  Brazil. 
  It 
  appears 
  to 
  be 
  resident 
  throughout 
  its 
  range, 
  

   unless 
  possibly 
  in 
  the 
  extreme 
  northern 
  part, 
  Trinidad, 
  and 
  Panama.] 
  

  

  DISTRIBUTION 
  AND 
  MIGRATION 
  OF 
  SWANS. 
  

  

  Olorcyg-nus 
  (Linn.). 
  Whooping 
  Swan. 
  

  

  This 
  swan 
  is 
  common 
  in 
  Europe 
  and 
  Asia, 
  and 
  formerly 
  was 
  not 
  

   rare 
  in 
  Greenland, 
  where 
  it 
  is 
  now 
  nearl} 
  T 
  exterminated. 
  Single 
  spec- 
  

   imens 
  of 
  late 
  years 
  have 
  been 
  taken 
  at 
  Ataogmik, 
  Godthaab, 
  Ivigtut, 
  

   and 
  Arsuk 
  in 
  southern 
  Greenland. 
  

  

  Olor 
  columbianus 
  (Ord). 
  Whistling 
  Swan. 
  

  

  Breeding 
  range. 
  — 
  The 
  whistling 
  swan 
  breeds 
  principally 
  north 
  of 
  the 
  

   Arctic 
  Circle, 
  but 
  a 
  few 
  nest 
  on 
  Southampton 
  and 
  Nottingham 
  islands 
  

   in 
  Hudson 
  Bay, 
  and 
  the 
  species 
  is 
  reported 
  as 
  breeding 
  at 
  Kennedy 
  

   Lake 
  in 
  Baffin 
  Land. 
  It 
  is 
  fairl} 
  7 
  common 
  during 
  the 
  breeding 
  season 
  

   along 
  the 
  Arctic 
  coast 
  in 
  the 
  vicinity 
  of 
  the 
  mouth 
  of 
  the 
  Mackenzie, 
  

   and 
  not 
  rare 
  throughout 
  much 
  of 
  Alaska. 
  A 
  few 
  pass 
  to 
  the 
  islands 
  

   of 
  the 
  Arctic 
  Sea, 
  even 
  to 
  latitude 
  74°. 
  One 
  of 
  the 
  parties 
  of 
  the 
  

  

  