others mating activities. May be demography-dependent male mating strategy in unit group that has unusually many adult and adolescent males. Not seen at Mahale except for few hours. 5. hesitate Uncertain to do something, for example, repeatedly advance to and retreat from targeted individual. Stimuli include aggressive posture or facial expression of targeted individual, presence of others nearby, or close proximity of observers or dangerous animal such as warthog. 3. See video. hiccup Involuntary contraction of diaphragm produces distinctive sound. Sounds like humans. See video. hide Goodall: Unhabituated chimps may hide behind a tree trunk, or pull a thickly foliated branch in front of them when a human approaches. Similar behavior seen at Mahale and Ta. Unhabituated bonobos do same thing. Cf. detour. 2. hit Bring down an