The animated film is based on the tale of Milos Matsourek.
One of the best productions of the director-animator Leonid Amalrik.
14 years after the release of the animated film, the scene of hospitalization of the hippopotamus with monkeys on stretchers was played up in the intro of "Well, wait!".
1967 - Iranian Ministry of Education Prize at the Second International Children's Film Festival in Tehran.
The animated film was released on VHS in the early 1990s and on DVD in the 2000s by Krupnyy Plan in the cartoon collection "The Biggest Friend."