1984 to 1993. loser support See support subordinate. lost call See whimper-scream. lost child See search for conspecific. louse Ectoparasites of two genera, Pediculus and Pthiris, parasitizing chimpanzees. See remove lice. See Fig. 25. L Fig. 25 Louse: Louse of Pediculus schaeffi recovered from chimpanzee of M group 118 Luo Scientific Reserve lower arm Groomee lowers arm, e.g., when grooming-hand-clasp ends, signaling intention to change role or posture. Groomer uses to request groomee to change role in bonobos. 3. lower head Two individuals face each other in social grooming, and one flexes neck to offer top of head for grooming. Also in bonobos. 2. See video. lower head and shoulder Mother lowers head and shoulders to drop off infant forward. See also drop infant. See video. lower leg