The Sulphur Crested Cockatoo has a very loud distinct call. It is a shrieking sound that sounds like "rack, rack, rack". Their vocalizations often mask other bird's calls because of how loud they are. Their vocalization are known to be chaotic and not have any harmonic properties. You may have heard these calls because Sulphur Crested Cockatoos are often kept as pets.
Here is the link to a vocalization: http://web2.uwindsor.ca/courses/biology/dmennill/Australia/SCCO.mp3
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