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The alarm calls of most species, on the other hand, are characteristically high-pitched, making the caller difficult to locate. [28] Communication through bird calls can be between individuals of the same species or even across species.
Dippers' calls are loud and high-pitched, being similar to calls made by other birds on fast rivers; the call frequencies lying within a narrow range of 4.0–6.5 kHz, well above the torrent noise frequency of maximum 2 kHz. [20]
Circlets of small white feathers surround the eyes. Males are brighter yellow on the throat than females. The birds are 10–13 cm in length and weigh about 10 g. [1] [2] They give a variety of high-pitched calls, with the distinctive and constantly uttered contact call a thin ‘psee’. [3]
The crested bellbird has a distinctive call. It has a high pitched bell-like call, with two slow notes then three fast notes, sounding like did-did-did-dit. [15] The call can also sound like water drops – dee-dee-dee-ook or plonk-plon-plonka. [16] Male birds sing from an exposed perch such as a dead branch or the top of a tree.
Its alarm call is a harsh, nasal "wah". Some calls are sex-specific: females produce a rattling sound, while males make a high-pitched "gleep gleep". Steller's jay is also a noted mimic: it can imitate the vocalizations of many species of birds, other animals, and sounds of non-animal origin.
The broad-frequency alarm calls are a series of 'churr' notes, low-pitched and harsh, occurring at low and high levels of intensity. [16] The narrow-band call is used in situations where the bird signals the presence of a predator and restricts information about its own location, while the broad-band alarm is used to attract attention, [ 19 ...
This call is often used while feeding and when a mallard drake is landing. It gives the other birds a heads up. The quack of a mallard drake requires voice and is replicated by humming into a special whistle-like call. In teals, the drakes make a call of short bursts of a high pitch whistle. The "teet! (pause) teet! (pause) teet!-teet!"
The rifleman has a range of simple high-pitched calls, the most commonly used call being a squeaky and repetitive zipt. [3] Their calls are partly in the ultrasonic range of frequencies, although it is unknown what function this serves or even if riflemen are able to hear sounds at these frequencies. [7]
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