![]() ![]() The male’s calls are also part of a threat display that takes the place of actual combat in repelling intruding rivals. Bird song is best considered the vocalization that is used in courtship and breeding, chiefly by the male, to advertise that he is ready to mate, to attract the female and perhaps stimulate her sexually, to keep the pair together, and to inform rival males that he has established a territory from which they will be excluded. Vocalization in birds includes a wide variety of calls besides the song proper and provides a means of social communication. Presumably this lengthening of the windpipe gives resonance to the voice. ![]() In certain of the birds-of-paradise known as manucodes, the elongated windpipe is coiled on the breast between the skin and the flesh. Sometimes this elongation is enclosed within the breast bone, or sternum. In some birds the windpipe is elongated and elaborately coiled. (But it is not a complicated syrinx alone that determines singing ability, for some true songbirds hardly sing at all). The song box reaches its greatest complexity in the true songbirds. A variable number of syringeal muscles and their controlling nerves adjust the tension on the membranes. The syrinx is an intricately constructed organ with a firm bony framework and filmlike vibrating internal membranes over which the air, during exhalation, passes rapidly, producing all the many utterances of the bird. The syrinx-as the voice-producing structure, or song box, is called-is located at the point where the windpipe divides into two bronchial tubes to go to the lungs. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions. ![]()
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