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 ?
18 Which C is a bird that has the same name as the sound of its two-note call and is best known for laying its eggs in other birds' nests?
A two-note call composed of notes resembling those of the primary song, but the second note often slightly higher in pitch than the first, was used by males preceding prey deliveries.
Its call is a four-note muffled whistle at night, usually given as a shorter, two-note call at dawn and dusk.