Fouts from 2000 to present. night nest See make night bed. Nimba Study area of Pan troglodytes verus in Nimba Mountains Biosphere Reserve, in Guinea and Cote dIvoire. Research done intermittently from 1991 to present by Y. Sugiyama and colleagues, especially K. Koops and T. Humle. nipple contact See contact with nipple. nipple press See fumble nipple. nod and mouth When seated, holds playmate in lap, or as it stands quadrupedal, repeatedly brings mouth to body of playmate, in nodding motion. Usually elicits play pants from recipient. Adult male hugs another from back and repeatedly puts open mouth to latters back for selfreassurance. See video. N nod to water surface Nod up and down repeatedly while standing quadrupedal and watching reflection of self on waters surface. Few individuals