👉 Hymenolepis, also known as the "sperm whale," is a type of marine mammal that lives in the waters around Australia. It is a large, streamlined fish with a long, curved tail and a distinctive white coloration. Hymenolepis are known for their ability to produce sperm that can fertilize eggs laid by other species, which is why they are often referred to as "sperm whales." They are also known for their ability to swim for long distances