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In non-breeding plumage, the cap is brown and the facial markings are less distinct. The song is a trill and the bird has a piercing flight call that can be heard while it is migrating at night. In the winter, Chipping Sparrows are gregarious and form flocks, sometimes associating with other bird species.
Grasshopper sparrows are unusual among New World sparrows in that they sing two distinct song types, the prevalence of which varies with the nesting cycle. The primary male song, a high trill preceded by a stereotyped series of short chips, is reminiscent of the sounds of grasshoppers [4] and is the origin of this species' name. Like some other ...
This was adopted by early researchers [127] including C.E.G. Bailey who demonstrated its use for studying bird song in 1950. [128] The use of spectrograms to visualize bird song was then adopted by Donald J. Borror [129] and developed further by others including W. H. Thorpe. [130] [131] These visual representations are also called sonograms or ...
The blackcap occasionally mimics the song of other birds, [20] the most frequently copied including the garden warbler and the common nightingale. The main call is a hard tac-tac, like stones knocking together, [17] and other vocalisations include a squeaking sweet alarm, and a low-pitched trill similar to that of a garden warbler. [16]
Immature birds have brown upperparts and pale brown underparts, and a plain head. Very young birds have a black beak with a pink base. The call is a chip, and the song is a rapid series of call notes chipchipchipchipchipchip. Java sparrows produce distinct trill-calls in different behavioral contexts, according to a study by Furutani et al. (2018).
The two primary songs for the Western Screech Owl are the bounce and double trill. In a recent study, researchers utilizes sonographic analysis of tape-recorded vocalizations to analyze whether the songs differ in male and females and if so, how accurately could songs be classified by sex.
Its "trill" is a "very short hoarse trill or rough chatter, similar to those that may terminate song, skreeek!". (Subspecies R. a. flavus "utters a more buzzy softer and higher-pitched trill".) Its "wheezy call" is made while excited or interacting with other birds.
The song of the bird is variable, but its typical pattern is a couple of “che” notes followed by a long, liquid trill; overall, the song is very similar to the songs of chattering and rattling cisticolas. The bird gives squeaky whistles and scolding calls. [2]