Amalj'aa Scavengers?

I need this mob for my Animus book...and I can only find one. There's lancers and Thaumaturges EVERYWHERE...but no Scavengers...why?

There near entrance to zanark (by the big gate) I just farmed the two there

There are three spawn points for both the Scavengers and the Brigands. One is by the 'road' that skirts along the cliffside to the west, a second by the entrance to the main compound, and a third between the two. Hope this helps.