A juvenile Sumatran orangutan Aazk (named after the American Association of Zookeepers) who lived at the Roeding Park Zoo (Fresno, California) was taught by Gary L. Shapiro from 1973 to 1975 how to "read & write" with plastic children's letters, following the training techniques of David Premack.
Orangutan Sumatra remaja Aazk (dinamai dari American Association of Zookeepers) yang hidup di Roeding Park Zoo (Fresno, California) diajarkan oleh Gary L. Shapiro dari tahun 1973 sampai 1975 cara "membaca dan menulis" dengan huruf-huruf plastik mainan anak-anak, mengikuti teknik latihan dari David Premack.