You find a corpse of a sea turtle that had beached itself on the coast of Darkshore some time ago.  It has been picked nearly clean by Greymist murlocs, the very ones who now have encamped themselves around the creature's remains.  Still, there appear to be some suitable samples left on the creature's remains that Gwennyth Bly'Leggonde in Auberdine might be able to make use of.