Communication is perhaps the most integral component of any relationship between living creatures.
The majority of animal species focus primarily on interchange that is audible, or perceptible by the ear. Humans, for example, instinctively use verbal capabilities from birth to express emotional and physical needs such as hunger, fear, pain, happiness, sorrow and confusion. At some point each of us has experienced the frustration of not being able to accurately relate certain thoughts or feelings to others. We also know how it feels when an individual does not acknowledge our spoken request or comment. Vocalization in cockatoos, indeed many birds, plays a dramatic role in their everyday lives as well.