For most animals, reproduction is straightforward: Some species lay eggs, while others give birth to live babies. But our recent research uncovered a fascinating mix between the two modes of ...

Females are born with between one and two million eggs. The number decreases until a person stops ovulating and reaches menopause. At that point, fewer that 1,000 remain. Sex and gender exist on ...

A lizard that both lays eggs and gives birth to live young is helping scientists understand how and why these forms of reproduction evolved. The old riddle, “Which came first, the chicken or the egg?” ...

An increasing number of women are freezing their eggs, according to the latest data from the UK’s fertility industry regulator, the Human Fertilisation and Embryology Authority. However, there is ...