Table 1.

AG sound type ethogram.

AG sound	description
extended grunts (EG)	voiced, atonal sounds produced by the chimpanzees with an open mouth
kisses (KI)	produced by inhaling air through pursed lips.
lip smacks (LS)	produced by placing upper and lower lips tightly together then pulling them apart quickly making an audible ‘pop’ sound
pants (PA)	audible, rapid, rhythmic sequence of inhaling and exhaling
raspberries (RS)	produced by blowing air out through pursed lips
teeth chomps (TC)	produced by clacking teeth together so that the hitting together of upper and lower jaws is audible