The female reproductive system includes organs that produce hormones like estrogen and progesterone. Ovaries release one mature egg each month during ovulation. Fallopian tubes transport the egg from ...

Wondering about the weirdest animals in the world? We've listed the Top 31 here — including the axolotl, aye-aye, blobfish, ...

Believe it or not, but ducks have a reputation for the unexpected: bizarre and intricate mating anatomy. According to ...

Researchers at the Icahn School of Medicine at Mount Sinai, in collaboration with other leading institutions across the ...

Early in development, many animals pick a team—male or female—based on their genetics, and, with time, acquire the ...

Scientists are making inroads in understanding one of the central mysteries of human reproduction: Why do women’s eggs deteriorate as they age? The broad strokes have been well-known — the ticking of ...

A duplicated gene evolved into a switch that determines sex in frogs, revealing how evolution can safely reshape critical ...

A new experimental study has found that perfluorooctanoic acid (PFOA), a widely used industrial chemical, can interfere with key biological processes required for successful embryo implantation, ...