Bird Species That Lacks Vocal Organ
By: NDTVNewsDesk
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New World vultures are the birds that lack a vocal organ called a syrinx and are nearly silent, producing only sounds like grunts and hisses.
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While they lack the syrinx found in other birds, they are not completely mute.
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The sounds are typically made by expelling air or by vibrating the syrinx in other birds.
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These simple vocalisations are used in specific situations, such as hissing when they feel threatened.
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To compensate for their limited vocal range, they use body language, such as posturing and head movements, to communicate.
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Black vultures produce raspy hisses and grunts that have been likened to hungry pigs or barking dogs.
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Turkey vultures are similarly limited to grunts and hisses, which they use when competing for a carcass or when irritated.
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While generally silent, King vultures produce guttural grunts and whistling hisses during courtship and in response to threats.
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