Few mammals actually get periods every month, or even at all, but why? Understanding what menstruation really is and why it happens could help ease symptoms & treat conditions that stem from the ...

Human animals have a simple, direct system: copulation and sperm delivery may lead to fertilization of an egg, if the timing is right. Once a sperm joins an egg, the resulting zygote gets implanted on ...

A new article in Ecological and Evolutionary Physiology examines how the immune system and reproduction interact in female mammals, especially during pregnancy, from mating to birth. Lauren E.

A surprising new study has found that blocking reproduction in some mammals may increase their life expectancy by an average ...

A large-scale analysis of 117 mammal species found that preventing reproduction is associated with longer lifespans, suggesting a strong link between reproductive activity and life expectancy. Why do ...

Energy intake is a critical determinant of reproductive performance in small mammals, particularly during energetically demanding periods such as lactation. Recent investigations have revealed that ...

Around age 50, women abruptly become infertile in a striking and puzzling permanent “change of life”—menopause. Although age at menopause ranges from 42 to 56 between women, an average near 50 is ...

A quiet revolution in recognizing menopause in other mammals was sparked by a 1990 whaling report indicating the presence of post-reproductive females among resident killer whales in coastal waters ...