Use of Gestures: Pygymy Chimps = 6-16 months; Common chimps = 2-4 years
Use of lexigrams: Kanzi = 46 new words; Mulika = 37 new words
Kanzi demonstrated correct use of "chase" and "ball" after being separated from his mother. This behaviour appeared shortly after he spontaneously began to use a gesture (hand clapping) for the same purpose.
Age: Examples of Symbols acquired by Kanzi
30-35 months Orange, Banana, Coffee, Juice
36-40 months Groom, egg
40-46 months Hotdog, Mulika, TV
Kanzi acquired 46 words and Mulika acquirede 37. Mulika's initial rate of acquisition was slower than Kanzi's. This could have been because Kanzi acquired some words before his mother's departure but not produced them.
Spontaneous Utterances = 80%; Prompted, imitated partially imitated = 11%; Combinations = 6%; Used to specify someone other than himself = 36%