For two weeks every mating season, a male will mate as ... That little crustacean has proportionally the longest penis of any animal on earth spanning up to 10 times his body size.

For any animal, releasing sperm cells requires a bit ... For a tiny fish called the medaka (Oryzias latipes), males have a mating capacity of 19 times per day. The findings are detailed in a ...

Animals also choose their mates, sometimes with a great deal of care. Mating systems are important to understand because they reflect the result of natural selection on mate choice, and ultimately ...