Communicating underwater is challenging.

Light and odors don't travel well, so it's hard for animals to see or smell.

But sound moves about four times faster in water than in air,

so in this dark envi

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Transcriber: 지수 김 Reviewer: Amanda Zhu

Killer whales are, without question,

one of the most universally recognized and respected species,

I think this is partly due to them

being one of the world’s mo

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