Just had an enthused conversation about Weddell Seals. Specifically that they sound like the Forbidden Planet soundtrack dubbed out by Scratch Perry, without needing anything so downright soft as a recording studio or an echo box to help them.
I was sure there'd been some chat about them on dissensus, but can't find anything now. Here's a clip from Herzog's documentary where he went to Antarctica. The shots of the scientists lying on the ice are just great.
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There are some other really long, equally amazing sound samples in a
blog post I did earlier in the year.