﻿TRUMPETER 
  SWAN. 
  87 
  

  

  southern 
  Iowa, 
  on 
  the 
  average, 
  March 
  19; 
  at 
  Heron 
  Lake, 
  Minn., 
  the 
  

   average 
  date 
  of 
  arrival 
  is 
  April 
  4, 
  earliest 
  March 
  21, 
  1889 
  (a 
  very 
  

   early 
  spring); 
  other 
  average 
  dates 
  are: 
  Nebraska, 
  March 
  16; 
  South 
  

   Dakota, 
  April 
  2; 
  North 
  Dakota, 
  April 
  15; 
  Saskatchewan, 
  April 
  16; 
  

   British 
  Columbia 
  about 
  April 
  20. 
  All 
  these 
  dates 
  are 
  later 
  than 
  those 
  

   which 
  mark 
  the 
  arrival 
  in 
  these 
  districts 
  of 
  the 
  early 
  ducks 
  and 
  geese. 
  

   Fall 
  migration. 
  — 
  The 
  trumpeter 
  begins 
  to 
  move 
  south 
  early 
  in 
  Sep- 
  

   tember, 
  crosses 
  into 
  the 
  United 
  States 
  the 
  last 
  of 
  that 
  month, 
  and 
  

   reaches 
  the 
  Gulf 
  of 
  Mexico 
  in 
  Texas 
  about 
  the 
  middle 
  of 
  November. 
  

   The 
  last 
  remain 
  on 
  the 
  breeding 
  grounds 
  until 
  October, 
  when 
  they 
  are 
  

   forced 
  away 
  by 
  the 
  gathering 
  ice. 
  

  

  