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That’s a reasonable design. The result would be interesting and may raise more questions than it answers. That is a good thing.
I don’t think this design would conclusively prove they were engaging in abstract communication, but that would take many experiments of similar scope.
A sceptic could say the unconditioned group reaction was a result of social awareness of the reaction of the conditioned crows. Sort of a collective freak out based on the immediate reaction of the marked individuals.
Regardless, I hereby tender my application to be colony manager of the research group. Murder Manager is the title I would choose.
Maybe not. You will have the same number of tax preparers chasing less work. Through the magic of the Free Market™️, shouldn’t that mean pressure to reduce prices? We can only hope.