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a male songbird's (i.e. singer's) filter contains the range of songs that it can develop; a female songbird's (i.e. receiver's) filter contains the range of songs that it finds acceptable for mate choice; In one possible situation, the population consists mainly of birds with wide filters.
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The organ is a solid, bony structure lined with a film of membranes which air passes through as the songbird calls. While the song boxes of songbirds vary in size and intricacy, this does not necessarily determine the songbird's ability to voice their song. Researchers believe this has more to do with the length of the windpipe. [8]
The northern cardinal is a mid-sized perching songbird with a body length of 21–23 cm (8.3–9.1 in) and a crest on the top of the head. The species expresses sexual dimorphism : Females are a reddish olive color, and have a gray mask around the beak, while males are a vibrant red color, and have a black mask on the face, as well as a larger ...
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The golden-crowned kinglet is a non-breeding resident in the winter in North Carolina. The golden-crowned kinglet is a widespread migratory bird throughout North America. Its breeding habitat is coniferous forests across Canada, the northeastern and western United States, Mexico and Central America.
The warbling vireo (Vireo gilvus) is a small North American songbird. Its breeding habitat is open deciduous and mixed woods from Alaska to Mexico. It often nests in widely spaced trees, often cottonwood or aspen, along streams or rivers. It migrates to Mexico and Central America. Measurements: [2] Length: 4.7–5.1 in (12–13 cm)
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