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I have observed that wood doves are more quiet than collared doves. Here you can see the difference between the two dove types:

https://www.youtube.com/watch?v=4s47XcDbcq0

The thing is that collared doves make a "crow" sound, especially while flying, while wood doves have no sound during flight. Is there an explanation for this?

And I also have observed that collared doves fight more than wood doves. Any explanations?

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