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Pied butcherbirds “seem to prefer some song rhythms over others,” such as isochronous rhythm, Mr. Xing said.

The Lanius, which in Latin can refer to butcherbirds, represents a new generation of drone: nimble, wired with artificial intelligence, and able to scout and kill.

For now, add another brutal move to the butcherbird’s vicious arsenal.

Rather than lying low when a predatory butcherbird announces its presence, a male wren will step up and sing along in a sort of daredevil duet.

Then they played the trill of the wrens singing immediately after the butcherbirds.