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.

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 ...

In mammals - including us humans - sperm are surprisingly picky about temperature, thriving best in conditions a few degrees cooler than normal body temperature. But, given that the female ...

An underlying principle of female reproductive biology appears to have been overturned by a report from researchers at Massachusetts General Hospital (MGH). In an article in the March 11, 2004 issue ...

This is a preview. Log in through your library . Abstract The distinctive features of reproduction in squirrels are the lack of allometric influences on the duration of reproductive investment; the ...