The ocean is home to a vast array of different animals, each with its own traits. These include different forms of mating, ...

The cellular biology of reproduction is often depicted as an epic journey, in which millions of intrepid sperm fight to be the first to claim the ultimate prize: the chance to fertilize the egg, which ...

It’s not just about chromosomes. Or reproductive cells. Or any other binary metric. Many genetic, environmental and developmental variations can produce what are thought of as masculine and feminine ...

Nature does not reward politeness, and being a male or female doesn't change that rule either. Across the animal kingdom, the ...