Parrots do not use language. They create Nominal Combinative messages.
Communication is the name of the game for the survival of this species. Hence, their signals which are signs, are important, but they are NOT language.
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(Remember, however, that material from the notes are not included in the exams.)
A nominal combinative communication which is more esoteric is found in some birds, particularly parrots.
Their calls are clearly combinative, but unlike the baby's cry or the cicada's buzz they are not instinctive but have to be learned.
The propensity to learn them, however, is instinctive and hence, the calls are considered nominal.
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