Deep voices

Deep voices ››
Suzuki and co used information theory to analyse whalesong and found that it has hierarchical syntax and unsuspected complexity. Not enough to be like human speech (not enough information transfer apparently, though I'm unclear on why that's enough to write the idea off) but impressive nonetheless.

"Although whale song is nothing like human language, I wouldn't be surprised if some marine mammals have the ability to communicate in a complex way," said Suzuki. "Given that the underwater environment is very different from our world, it is not surprising that they would communicate in rather a different way from land mammals."

In other words, don't write off the orcas just yet. (HHMI press release) (via)
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