Based on many years of research, the illustrated monograph "The Chimp Child and the Human Child in Their Instincts, Emotions, Games, Habits and Expressive Movements" brought N. N. Ladygina-Kots world fame and was translated into major European languages. The work received numerous rave reviews in a number of domestic and foreign publications. Its fragments were included in textbooks on zoology and evolutionary teaching for high school and universities.