Gert Nygårdshaug (b. 1946) is a famous Norwegian writer, author of crime novels, one of the creators of the environmental thriller genre. The novel “Doctor Mengele's Zoo” (1989) is the first book in the series of novels about Mino, which won the love of readers and received recognition critics. This is a story about the confrontation between the unique fragile world of the Amazon rainforest and the cruel world of business, where there is no place for feelings and mercy; about the terrorist group "Mariposa", which has achieved stunning results through fearlessness, ingenuity and caution. "Mariposa" operates throughout the world, leaving a calling card at crime scenes - a photograph of a butterfly. The best members of the world's intelligence services have been sent to catch the terrorists. What is the secret of the Mariposa's invulnerability? Why do its members commit their cruel crimes?