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A 2023 study found a correlation between the dawn chorus of male birds and the absence of females. The research was conducted in southern Germany, with male blue tits being the birds of interest. Researchers "found that the males sang at high rates while their female partners were still roosting in the nest box at dawn, and stopped singing as ...
Some sources distinguish between simpler vocalizations, termed “calls”, reserving the term “song” for more complex productions. [2] Song-like productions have been identified in several groups of animals, including cetaceans (whales and dolphins), avians (birds), anurans (frogs), and humans. Social transmission of song has been found in ...
The tūī is a large honeyeater, 27 to 32 cm (11–13 in) in length. The Chatham Islands subspecies is larger on average than the nominate subspecies, and heavier. Males tend to be heavier than females. Nominate males weigh between 65–150 g (2.3–5.3 oz), and females 58–105 g (2.0–3.7 oz).
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Distinguishing males and females based solely on their singing is difficult. A bioacoustic analysis performed on both male and female songs revealed that male fee-bee singing fluctuates more, and the absolute amplitude of both sexes is the same. [21] The most familiar call is the chick-a-dee-dee-dee, which gave this bird its name.
The archosaurian shift from larynx to syrinx must have conferred a selective advantage for crown birds, but the causes for this shift remain unknown. [10] To complicate matters, the syrinx falls into an unusual category of functional evolution: arising from ancestors with a larynx-based sound source, the syrinx contains significant functional overlap with the structure it replaced.
The sounds were “composed of four stages: the vowel /o/, a transition, the vowel /a/ at a steady pitch, and /a/ rising in pitch,” the press release explained.