Looks are certainly important for the peacock, with his absurdly bright, burdensome train that he shows off to attract a female. Peahens often choose males for the quality of their trains -- the ...

Aa Aa Aa A mating system describes how males and females ... which may negatively impact the female's reproductive output. The importance of male mate choice is controversial.

University of Manchester scientists have discovered significant concentrations of microplastics in the male reproductive system of sea ... organs of both male and female turtles, including the ...