The book is a vivid story, written with great humor, about the adventures of four members of an Italian zoological expedition that visited the Comoros Islands, Zanzibar and the coast of East Africa in 1953. The purpose of the expedition was to prove, by studying the animal world of this area, the existence in the distant past of an isthmus connecting Africa with Asia. The book describes the hunt for various animals inhabiting the region of the Comoros Islands: lemurs, which after much work the expedition members managed to tame, mammals living in the sea - dugongs, which appear in ancient myths as “sirens”, etc. A significant part The book is dedicated to underwater exploration, dangerous adventures under water and on its surface.