Debate and discussion of any biological questions not pertaining to a particular topic.
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I think it's a 'Nobody Knows'. but if you listen hard to two blackbirds slagging each other off, you pretty soon start hearing things like 'your wife's the ugliest ever!' 'not quite, and yours doesn't know who her father is.' etc. And then they usually end up coming to blows, and will often fight to the death. Sometimes a well defined language can be a real handicap.
Songbirds sing intricate songs for mate attraction and territorial defense, which they learn early in life
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