[Southack]

"Or you could falsify genetic drift by finding genetically isolated populations that are genetically identical."

Are the pigeons in London really different than the pigeons in New York City?

[Alter Kaker]

Are the pigeons in London really different than the pigeons in New York City?

No, but then they're not genetically isolated either. Pigeons, for whatever reason or another, are brought all over the world all the time, which is why you find them in most every city in the world, despite being native only to Europe and small parts of Southwest Asia and North Africa.