Successful reproduction presents a fundamental evolutionary paradox: the immune system must tolerate genetically foreign sperm and embryos while maintaining ...

But exploring the evolutionary roots of these diverse maternal methods is tough, because reproductive tissues decay quickly ...

A groundbreaking study reveals that flowering plants may have begun developing large, animal-friendly fruits long before the ...

Sea stars can produce eggs for up to 200 years. Their surprisingly human-like ovaries may offer clues about fertility and reproductive aging.

A new study has uncovered a fundamental link between brain size and offspring size, helping to solve a long-standing evolutionary puzzle: Why do birds lay such disproportionately large eggs?

At first glance, bat sea stars, the nubbly, orange, many-footed creatures often found on the seafloor, seem about as far from humans as one can get. Appearances can be deceiving, however. Scientists ...