Kubie's gesturing to Zura a medium percentage
of audible gestures were performed when Kubie had Zura's visual attention.
Playface: A very low percentage
of audible gestures were performed with a playface from Kubie.
Contact between gorillas resulted at medium or low rates (lowest for chestbeat),
but there were high rates of approach or change of locomotor activity, and of
gaze direction after a chestbeat or knocks.
for audible gestures were games with visual barriers between gorillas (trees or rocks), and
for chestbeat, a long distance separation between gorillas.