two-note call

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Noun1.two-note call - a birdcall having two notes; "the two-note call of the cuckoo"
birdcall, birdsong, song, call - the characteristic sound produced by a bird; "a bird will not learn its song unless it hears it at an early age"
References in periodicals archive ?
Its call is a four-note muffled whistle at night, usually given as a shorter, two-note call at dawn and dusk.
When she issues a high-pitched two-note call, they come running to her.