ScottB
Contributor
The anatomy of their inner ears may be different.. not requiring equalizing? But like the holey skull showed, they do have sinuses
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Firebrand:Primates are the only animals with sinuses, and human's have the largest sinus cavities. Most animals can automatically equalize to the ambient pressure. I've never heard of a mountain goat coming down the mountain because he couldn't equalize at elevation, so why wouldn't it work for increased pressure?