Definition of subsong in English:

subsong

Syllabification: sub·song
Pronunciation: /ˈsəbˌsôNG, ˌsäNG
 
/

noun

Ornithology
Birdsong that is softer and less well defined than the usual territorial song, sometimes heard only at close quarters as a quiet warbling.
More example sentences
  • In the laboratory, hand-reared birds perform subsong throughout their first autumn and winter.
  • Every time the bird compares its own subsong to the memorized template, the syllables most similar to those present in the template become slightly more probable.
  • That is, does the bird amplify and modulate the amplitude of subsong primitives, or shorten and protract them, or reorder them, etc.?

Definition of subsong in:

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