Genes associated with male reproductive biology appear to be under relaxed selective constraint in a primate species with low sperm competition.

Males of the species Drosophila melanogaster pack thousands of almost two-millimeter-long sperm cells into significantly smaller storage organs. A new study reveals how they move in an orderly manner ...

Taxidermied, locked behind plexiglass and spinning slowly on a wooden dais in the National Museum of Scotland in Edinburgh, UK, the world’s most famous ewe remains a public spectacle three decades ...

A new study of wild bats reveals that an animal's immune system is shaped by more than its need to fight infections. Researchers from the University of Maryland have found that sex, age and ...

A major transition in evolution is the shift from asexual to sexual reproduction in early organisms. But why would a yeast ...

AI doesn't just generate images; it mirrors our biases. New research shows how it can reinforce unrealistic body ideals, ...

Depending on the type of intersex variation someone has, it could alter their chromosome makeup, genital appearance, hormonal balance, and more. Share on Pinterest Maskot/Getty Images We’re born with ...

20.29 x 25.39 cm. (8 x 10 in.) Subscribe now to view details for this work, and gain access to over 18 million auction results. Purchase One-Day Pass ...