The German broadcaster NDR reported on the examine and included audio examples on its web site. The blackbirds had been chirping the alarm sign of Bolt electrical kick-scooters, a sound usually solely emitted when the autos are moved with out permission.
Ornithologist Bernd Koop defined that the frequency of the e-scooter alarm sign matches the frequency and rhythm of blackbird tune. Blackbirds usually imitate the songs of different birds. “But when they hear a tone or a sequence of tones extra continuously, as with the e-scooters, they grow to be curious. And in the event that they prefer it, they imitate it,” the knowledgeable defined.
He assumes that the sound can also be more likely to unfold shortly amongst blackbirds in different cities with electrical scooters. “The blackbirds discover the sound enticing,” says Koop. For the males, the appropriated tune might assist them discover a mate.
ndr.de (in German)