The theory on these nose-ticks is that they've evolved to aim for the nose because their hosts are often chimpanzees, common in Kibale. Chimps are very fastidious about parasites; it's difficult to have a very long life feeding on a chimp, because grooming is such an integral and dominant part of their social structure. One place where the chimps don't groom, however, is the inside of the nose--so, we think, that's why these ticks aim for the schnoz.