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i'm wondering if 15-25 generations (that's approximately how many generations of garden birds were there since the invention of the cigarettes with filters) are enough for evolution to actually show this trend here

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Tangentially related - there was the russian experiment on fox domestication that had decent success in selecting for "tameability" with just 3 generations.

http://www.bbc.com/earth/story/20160912-a-soviet-scientist-c...

I think some birds are actually pretty smart and can learn by imitating other birds, so it's a cultural thing. All it takes is one bird to discover it.

Take a look at this video: "Crow uses a vending machine". It was an experiment where they trained crows to collect coins and put them into a vending machine for a few grains.

https://www.youtube.com/watch?v=1qSsVBPh9Lo

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