leg Reach leg instead of hand to another individual, with similar function to extend hand. Shown especially when performing extend hand E 74 eyes open difficult, e.g. in tree or when performer holds infant and food. Seen in bonobos. See video. extend leg as ladder Mother extends leg to help infant to come to her. See also aid in locomotion and extend arm as ladder. See video. E extended grunt See grunt, extended. extract Sanz and Morgan Gathering an item or fluid with a tool for the purpose of extracting it from a location that is difficult to access manually. Includes fish, dip, pick out bone marrow, etc. 3. eyes closed See close eyes. eyes open See open eyes. F F face close See peer. fall Drop by