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Author Question: Among songbirds, a "crystallized" song is one that A) is beyond the range of hum (Read 522 times)

penza

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on: Oct 27, 2013
Among songbirds, a "crystallized" song is one that
A) is beyond the range of human hearing.
B) is perfected by juveniles.
C) extremely young chicks sing.
D) is a perfected species-specific song.
E) warns of predators.


Celeste

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Reply #1 on: Sep 1, 2019
D


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