There are actually two types of bird vocalizations, calls and songs. Calls are used for communication purposes, for example, to signal the presence of a predator, alert other birds of food sources, or to keep members of a flock in range. Songs are much more aurally complex than calls. Scientists are still unsure what purpose such songs serve (maybe no purpose, like human songs) but hypothesize that they are related to mating and courtship rituals. The fact that most male birds sing only during mating season supports this hypothesis.
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