This is a Slovenian translation of a Croatian fable for children, written by a popular Croatian poet and writer Vesna Parun (1922-2010). The text on p. 53 quotes Parun’s biography and the text on the back cover explains the benefit of fables in children’s education.
The vibrant mid-century illustrations in blue and black were made by a Croatian artist Vesna Borčić (born 1920), who graduated from the Zagreb Art Academy and specialized in illustration.
The book was translated by France Kosmač (1922-1974) who started writing during WWII, when he was a part of the resistance movement, and became a known movie director after the war.
The book comes from a de-accessed archive of a publishing house and is seemingly unread.
References: OCLC 438507419.