We used to think the ‘sex’ of an animal was clearly defined by its chromosomes. But it’s way more complicated than it seems.

The Max Planck team measured the lifespans of 1,176 wild creatures. Female mammals, the analysis showed, live 13% longer on ...

A global study of over 1,100 species reveals an evolutionary reason why females consistently live longer than males.

THE complete sequence of the human X chromosome was published in Nature this week. The work shows that large segments of it match parts of normal chromosomes in birds, confirming the X chromosome’s ...

A greater flamingo in Mallorca, Spain. Unraveling a genetic mystery revealed that flamingos and doves are more distantly related than previously thought. An enormous meteor spelled doom for most ...