how does a bird produces sound?

Answer 1

From its mouth.

Answer 2

Read on mate...heres exactly how a bird does it...

When a bird breathes it takes in air through its bill, draws it in past its throat and into its windpipe (or trachea). The windpipe forks to carry some air to each of the lungs. These dual passages are called bronchial tubes (singular -bronchus, plural -bronchi). Air is then processed in the lungs and exhaled back along the same route.

This system of air passage has become adapted for the secondary purpose of sound production (as it has in humans too). At the point where the windpipe divides is situated the bird's sound producing organ, a "voice box" called the syrinx. Humans have no syrinx but a larynx instead. The larynx is a cavity in the throat and contains our vocal chords. The avian syrinx is called a lower larynx, being differently situated at the other end of the windpipe. It is as if the human larynx were positioned in the chest. Perhaps the first thing to say about the syrinx is that it is double-barrelled - as if a man had twin instruments between his lips and was playing one with the outflow of one lung, and the other with air from his second lung.

Theoretically a bird with one collapsed lung would then still be able to produce sound. If, however, it were a species that is known to produce two different sounds simultaneously, then clearly it would not be able to offer a normal contribution to nature's symphony.

Each half of the bird's voice box is in the mirror-position of the other, at the top of its own bronchus (so the set up is literally double-barrelled) and each consists of a pair of organs opposite each other on the wall of its bronchus. Thus if you were to slit open a bronchial tube, you would see on one side a little tympanum, a circular elastic membrane. This is the vocal chord; and opposite it would be a little "bump" of erectile tissue.

The stage is now set. The bird is about to take its cue. It forces air along the bronchial tube, past these two organs, both of which can be adjusted. The diameter of the tympanum can be changed and the degree that it protrudes into the bronchial tube can also be varied.
Grasshopper Warbler (Locustella naevia) (18K)
Grasshopper Warbler Locustella naevia in song.
As air passes, so an acoustic disturbance is set up, the tympanum vibrates and sound is created. The pitch (frequency) of that sound and the loudness (amplitude) of it can be modulated. So far as the tympanum is concerned, these two effects are usually coupled. The function of the extendable little "bump" is believed to be to change the loudness without having to change the pitch. Bear in mind that the bird may be playing at the same time a second tune on his other half; also that this description is considerably simplified. It will be clear, however that such complexity is necessary to explain the amazing vocal gymnastics certain "higher" songbirds display. "Lower" birds have a syrinx that is of a rather simpler design. In either case the physiology and acoustics of bird vocalisation are unique in the animal kingdom; further, birds produce more complex sounds than any other animal, certainly including man.

One last point: birds do not sing only when inhaling. A grasshopper warbler Locustella naevia may "reel" for over two minutes, a nightjar may chur continuously for eight minutes, and a skylark may "pour forth its full heart" in completely unbroken song for 18 minutes. To replenish their oxygen these birds must breath in; and must do so while singing. In the case of the night jar, the bird discernably alternates soft short trills with loud long ones and these short trills are believed to be when the bird inhales. Less continuous singers may also use air travelling in either direction. The white-rumped shama, for example, is believed so to do.

Answer 3

Bird songs are certain vocal sounds that birds make—in non-technical use, those sounds that are melodious to the human ear. In ornithology, bird 'songs' are often distinguished from shorter sounds, which may be termed 'calls'

Definition

A European Starling (Sturnus vulgaris) singingThe distinction between songs and calls is somewhat arbitrary. Ehrlich et al. say that songs are longer and more complex, and that calls tend to serve such functions as alarms or keeping members of a flock in contact, while songs claim territory and advertise for mates. Other authorities such as Howell (1994) make the distinction based on function, so that even short vocalisations such as those of pigeons are considered songs—and even non-vocal sounds such as the drumming of woodpeckers and the "winnowing" that snipes' wings make in display flight. Still other investigators say that song must have syllabic diversity and temporal regularity akin to the repetitive and transformative patterns which define music.
Most song is emitted by male rather than female birds.

Anatomy
The avian vocal organ is called the syrinx; it is a bony structure at the bottom of the trachea (unlike the larynx at the top of the mammalian trachea). The syrinx and sometimes a surrounding air sac resonate to vibrations that are made by membranes past which the bird forces air. It controls the pitch by changing the tension on the membranes and controls both pitch and volume by changing the force of exhalation. The bird can control the two sides of the trachea independently, which is how some species can produce two notes at once.

Answer 4

The science of avian vocalization
How birds make sounds is still the subject of many studies. We use vibrations of our vocal cords to vocalize and our tongue and lips to form words. A human's vocal cords are located in the larynx. Birds also have a larynx, but avian speech is not made in the same way. Birds also have a structure in their throats called a syrinx, which is thought to be the source of the sounds they make. The syrinx has a pair of structures called medial tympaniform membranes, which produce a flow of air in the throat that results in sounds. It is also thought that a bird's unique respiratory structure, including multiple air sacs, has a function in causing the vibrations of the tympaniform membranes and thus, sound and speech.

see the link below for a diagram

Answer 5

Most sounds made by birds are produced by the avian vocal organ, the syrinx. Contraction of muscles (thoracic & abdominal) force air from air sacs through the bronchi & syrinx.
The air molecules vibrate as they pass through the narrow passageways between the external labia & the internal tympaniform membranes and produce the birds calls.

Answer 6

The bird produces sound through its wings

Answer 7

doesn't it work the same way humans do?

Answer 8

THROUGH ITS BEAK AND A SALAVERY GLAND FROM WHERE THEY BREATH