Revelation on Instagram: "Donald and Gua experiment 1930. The Donald and Gua experiment was a 1930s study by Winthrop and Luella Kellogg where a chimpanzee (Gua) was raised alongside their infant son (Donald) to compare human and ape development, finding Gua learned human-like skills (walking, spoon-feeding) but struggled with language, while Donald started mimicking Gua's sounds, leading to the experiment's early end as it seemed to hinder the human child's speech, proving environmental influen