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xkcd #3216: Bazookasaurus
(imgs.xkcd.com)
Title text:
In contrast to the deep booming sound associated with the cannon in pop culture depictions, recent studies show it actually made more of a 'toot toot!' noise.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3216/
The noise commonly associated with bazookasaurus is actually made by the red tailed hawk