Asian Elephant And House Mouse (IMAGE) Stockholm University Caption The sperm of the Asian elephant has the shortest sperm relative to its body size, whereas the house mouse (Mus musculus) has the longest. Humans and elephants have sperm of roughly the same length, less than half the size of mouse sperm. Credit Photo: Mostphotos Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.