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In the forest of kelp:

Into the deep by H. Hall (1994)

Mrs. Swellshark does her best, laying her single egg on the floor

a mr. Garibaldi throws his casual lady out, before she starts eating the fertilized eggs..

the great annual sex orgy of opalescent squids

goes wrong once more, and they ALL die soon after laying their eggs:

but they'll be there again, next year... Hey, maybe this time everything will work out fine...

The sarcastic fringehead's weird mouth seems to be the inspiration for the Predator's

The California spiny lobster change his suit of armor, but not his habits

And like every morning the sea lions dive here, just to chew these stems on the bottom:

And nobody knows WHY. Except themselves; and since they're the only beings being affected by that process, I guess it's all right. Of course, this Imax movie would be an awesome experience inside an IMAX theatre; it still is kind of great-ish in mkv 1280x720 dolby AC3, when every single still image can be a great desktop wallpaper; and the headphones still are the best sound system around.