I found this article while researching that ‘reptilian speech’ ask, and just had to share. Yes, the scientists actually had alligators inhale helium to measure their calls. Yes, it was legit science and actually gave us really good information. It’s also just ridiculous and I adore it. TL;DR, the frequency of an alligator’s call is a reasonable indicator of the size of the animal producing it.
I also learned from this (and the linked article within it) why helium makes your voice sound squeaky! In short, it’s actually the density of helium gas that makes the different. Helium is about seven times less dense than air, so your vocal cords can push on it faster and therefore the wavelength of the sounds they create is faster.
Imagine how confused those alligators were, though.
Alligator On Helium Reveals The Secret Meaning Of Alligator Bellows



