Why are owl hoots low-pitched?

There was an owl hooting outside our house earlier, and it occurred to me that every other bird has a high-pitched call.

Ravens have a croak that could be considered low, but their loud call is a caw that's higher. I can't think of another bird with a call nearly as low as owls'.

Search engines are no help, mostly duplicates answering why they hoot. Why are owls' calls so much lower than other birds?

Paragone ,

I think everybody here's right.

However, that still doesn't answer the question of how they are so low...

I believe that would require that their "voicebox" be huge, compared with other birds'.

Every bit as much a guess as the others, here,

but a knowledge-based guess, as the others are, too.

Insightful question!

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