Parents should bias sex allocation toward offspring of the sex most likely to provide higher fitness returns. Trivers and Willard proposed that for polygynous mammals, females should adjust sex-ratio ...

Juvenile social play predicts adult reproductive success in male bottlenose dolphins, a new study has found. Juvenile social play predicts adult reproductive success in male bottlenose dolphins, a new ...

Animals have personalities too—and some animal couples raise their young better based on how well their personalities match. Greylag geese, which mate in long-term monogamous relationships, have ...

A study of more than 100 greylag geese found individuals were consistently different in personality traits, ranging from boldness, aggressiveness, sociability to other behavioural traits. Birds of a ...

Male bonobos have an impressive ability to detect when females are most fertile, even though the usual visual cues are unreliable. Researchers tracking wild bonobos in the Congo discovered that males ...

New study from Case Western Reserve University reveals link between oxygen delivery and reproductive success among women living on the high Tibetan Plateau Breathing thin air at extreme altitudes ...

Challenges in meeting these goals often stem from trace mineral deficiencies and can have a domino effect across production ...

A new scientific review challenges the widespread idea that certain physical features in women serve as biological signals of high fertility. The comprehensive analysis suggests that characteristics ...

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. Subscribe to our ...