A major threat to the world's porpoises comes from an unexpected quarter: Dolphins who aren't getting any. Dolphins sometimes kick the crap out of porpoises just for funsies -- they don't really compete for food, and science has not yet established the existence of dolphin racists, so it wasn't clear that there was any rhyme or reason to the vicious watermammal-on-watermammal attacks. But now it turns out that the aggro dolphins are mostly young males, so conservation expert Mark Cotter theorizes that this is basically aquatic Fight Club. Get ready for some science talk: Young male dolphins don't have thumbs. …
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Jess Zimmerman is the editor of Grist List.