Some land animals, such as bears and kingfishers, eat animals that live in the water. In turn, some animals, such as crocodiles, that dwell primarily in water will eat animals that live on land. Also, many amphibians, such as frogs, and also some insects, start their life in the water, where they can prey and be preyed upon.
Sound production is also known as phonation, and involves the process of vibrations generated by a combination of respiration, the vocal organ and the vocal tract. The physical structures that birds use are highly similar to that of humans, and the sounds that is generated travels through respired air.
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