Sounds paradoxical? According to a new study, it makes perfect sense. Researchers have shown that the size of the animal determines sperm.
The sperm of the Asian elephant has the shortest sperm relative to its body size, whereas the house mouse (Mus musculus) has the longest.
A spermatozoon is a motile sperm cell, or moving form of the haploid cell that is the male Contents. 1 Mammalian spermatozoon structure, function, and size.