It's clear from the article that they were in pretty constant communication with the birds, via megaphone. At one point one of the scientists mentioned calling

It's clear from the article that they were in pretty constant communication with the birds, via megaphone. At one point one of the scientists mentioned calling to one of the birds by name. I couldn't tell (but would like to know) if that implies the birds recognize and respond individually, or whether the names of the recalcitrant were invoked more generally, in imprecation.