Certain types of songbirds have
evolved to use their songs to find mates that they will stay with for the rest
of their lives. Researchers discovered that each sex uses what is called the
sound control system to convert sound waves into social messages. Humans do
something similar when they use vocal sounds and speech to communicate, but
songbirds are far more advanced at it.
Finches, for example, must learn
their songs during the first 90 days of their lives. If they are unable to do
that, they will likely never find a mate. They may still be able to sing, but
the song will be too poor to attract a mate.
The songs that finches sing are
based on the songs of their fathers.
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