So understand, animal, [unintelligible] ad version ... have been standing still for a thousand years, while the long vowels did their merry chase. It's called the great vowel shift.

So long wavelengths have room to resonate ... And as far as we can tell other animals' brains just aren't wired to use vowels the same way that we do. I love that even though we have these ...

With a live but sedated monkey, the researchers manipulated the animal's tongue and documented ... and indicated that a macaque could not produce vowels, such as the long E, common to most ...

So we should be able to compare language with less complex animal communication ... the full human vowel inventory required a vocal tract with about equally long oral and pharyngeal cavities.