We pause our berry gathering to more closely examine the kinnikinnick. On many parts of the shrub, the smooth, leathery green leaf margins are accented by bulbous, yellow-red growths. Unmistakably, these are galls, tumor-like growths of the leaf tissue. Each gall was induced by a manzanita leaf-gall aphid (Tamalia coweni), a female aphid who probes along the leaf to form a tiny home.