It was happily singing its whisper song, and at the end of each phrase, it inserted the alarm call from an emergency vehicle.
I've witnessed this just once before, some years ago in Western Australia, in a public park. A magpie was mimicking a race caller on the radio. That magpie did not insert his mimicking into his usual carolling, as this one did, he concentrated entirely on his imitation of someone calling a horse race on the radio, including background crowd noises. Remarkable.
|Australian Magpie (this is not the bird that was mimicking)|