Bring 3 Intact Murktide Tails to Makra Knifewhisper on the southern cliffs of Val'sharah.
Makrura are massing down by the shore, and far too many of them seem to practice water magic. I think they're planning to summon a massive wave.
Also, I've come a long way, and I'm out of supplies. I'm so hungry, I could eat almost anything. Even the makrura you kill. Just cut the heads off first.