Concord, Mass.
1912.
Sept. 19
[September 19, 1912]

Night calls of migrating Thrushes

  Night cloudy, calm and oppressively warm following a 
hot and humid day. Although I had seen very few birds
about they were migrating in some numbers between 10 and
11 P.M. when I heard the calls of Warblers or Thrushes
every few minutes as I sat reading in the cabin with
door & windows open. One of the Thrush calls repeated
several times within my hearing was evidently that of
either a Gray-cheeked or a Bicknell's Thrush being,
indeed, essentially the call we hear by day in June on 
Mt. Washington but yet not quite the same & probably
representing the night cry of the species. As compared with
the day call it was shriller & more strident. The 
other Thrush calls heard seemed to be those of
Wilson's Thrush or at least indistinguishable from
them. I noted the Wilson's Thrushes at the Farm
on the afternoon of the 17th [September 17, 1912] seeing one distinctly & very near.