http://en.wikipedia.org/wiki/Mouth
In frogs, the sounds can be amplified using sacs in the throat region.The vocal sacs can be inflated and deflated and act as resonators to transfer the sound to the outside world.A bird's song is produced by the flow of air over a vocal organ at the base of the trachea, the syrinx. For each burst of song the bird opens its beak and closes it again afterwards. The beak may move slightly and may contribute to the resonance but the song originates elsewhere.
In frogs, the sounds can be amplified using sacs in the throat region.The vocal sacs can be inflated and deflated and act as resonators to transfer the sound to the outside world.A bird's song is produced by the flow of air over a vocal organ at the base of the trachea, the syrinx. For each burst of song the bird opens its beak and closes it again afterwards. The beak may move slightly and may contribute to the resonance but the song originates elsewhere.
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