A new study, reporting that “better” fathers have smaller testicles, is creating a stir, probably in part for the number of jokes it inspires. Time’s headline is “Study: Choose dads with smaller ‘nads ...

Testicle size does not matter for monogamous birds, who have traded in big testes for other traits like colourful plumage and dancing displays, a study has found. The researchers analysed the largest ...

Men with smaller testes are more likely to be involved in hands-on care of their toddlers, a new study by anthropologists finds. Smaller testicular volumes also correlate with more nurturing-related ...

A United States study measuring fathering habits and testicle size suggests that bigger may not be better when it comes to the day-to-day raising of small children. The research involved 70 American ...

A study Monday measuring fathering habits and testicle size suggested that bigger may not be better when it comes to the day-to-day raising of small children. The research involved 70 men of varying ...

The relative size of a man’s testicles may influence the chances of him being a good father according to a study suggesting a biological basis for parenting abilities in men. Men with larger testes ...

Changes in population density can affect the size of animals’ testes and therefore impact on reproduction, researchers have found. Across the animal kingdom, there is usually a positive relationship ...

This is a preview. Log in through your library . Abstract Evolutionary theory predicts that more resources are allocated to sperm production when sperm competition is high. This prediction is ...

Having both parents care for a child not only increases its survival, but also improves its mental health, social skills, and educational prospects. Obviously, it’s best for both parents to be ...

When I covered the sequencing of the chimp genome, one of the notable findings was that many of the genes that have changed the most between these two species were involved in the male reproductive ...

Men with smaller testes than others are more likely to be involved in hands-on care of their toddlers, a new study conducted by anthropologists at Emory University finds. The Proceedings of the ...