subsong

subsong

(ˈsʌbˌsɒŋ)
n
(Zoology) a subdued form of birdsong modified from the full territorial song and used by some birds esp in courtship
References in periodicals archive ?
The crow's "Caw!" is immediately recognisable to the human ear, but the birds actually have, not even counting the "subsong" sounds they make: clacking and cooing and rattling and clicking.
No subsong. Call of alarm, spreketh & ought damage the eyes with its form, small body, tail pricked up & beak like a hair
Typically a male sings an initially undeveloped subsong that crystallizes into adult song before he establishes a territory (Grant and Grant 1989).