Research done by T. Kano and colleagues from 1973 to 1977. yawn Goodall Yawning. Plooij YAW. Kano Yawn for the bonobos. See videos. Y 207 Discussion Our list contains 891 behavioral patterns of Mahale chimpanzees, 45 patterns that have been recorded at other sites but not at Mahale, 91 nouns concerning chimpanzees and their study sites, and 357 synonyms, totaling 1,384 terms. Thus, we have added more than 500 new terms to the previous publication. The last publication was the product of research that spanned more than 30 years. Why so many patterns have been added must be explained. First, we did not use videographic records extensively for the last publication. Although we referred to video records taken by ANC Production and East Company, they were not major