Whipbird

Eastern whipbirds rank among the most fantastic singers in the world. Their songs are duets between a mated pair. The male begins the duet with a two-syllable song; his song begins with a sustained pure-tone whistle followed by an explosive whip-crack. The female completes the duet by singing a two-syllable response, that sometimes sounds like chew-chew.

Male whipbirds create their unique whipcrack sound by singing a very rapidly ascending or descending whistle. The male’s whistle stretches from 500 to 8000 Hz in just 0.1 seconds; very few animal vocalizations cover such a broad frequency range in such a short space of time.
The whip-like crack sound is created by the pressure of an high-amplitude sound wave echoing off the leaves in the whipbirds’ rainforest habitat