mostly done by juveniles. See video. sneer Goodall: The upper lip is retracted, sometimes on one side more than the other, to expose part of the upper teeth. In the wild the context is associated with fear of a human or a human associated situation. Only a few chimps sneer. Plooijs Sneer. At Mahale few individuals sneer. Cf. grin. 9. See video. sneeze Goodall: Chimps sneeze in the same way as humans. See also probe nasal passage. Kanos Sneeze for bonobos. See sickness. See video. sniff Goodall Sniff. Put nose close to something, such as substrate, vegetation, tree trunk, fruit, food wadge, feces, urine etc. apparently to obtain information about which chimpanzee or what kind of animal was there. Sniff ground after left behind by companions, or when