How a sperm and an egg fuse together has long been a mystery. New research by scientists in Austria provides tantalizing clues, showing fertilization works like a lock and key across the animal ...

Sperm washing is a process performed to separate healthy, motile (moving) sperm from the collected semen sample. When semen is collected, it contains not only sperm but also dead or weak sperm, ...

A group of sperm whales, including nonrelatives, work to keep a newborn calf afloat in the hours after its birth. (Project CETI) The researchers knew something was off. It was July 2023, and they were ...