The male cardinal in this video clip is not very subtle as he checks out a female - read our analysis of this behavior.

Molecular evidence from a 2-million-year-old southern African hominid species indicates sex and genetic differences in P. robustus.

An investigation of family and other interactions in our social network shows that dog owners rate their relationship with ...

The male sage grouse puffs up, pops air sacs, and dances in leks to win over females in a high-stakes mating ritual.

His mate had been run over. And her condition was not right.

Manchester United's decision to sell Scott McTominay to Napoli may have seen like a good deal at the time, but with the Scottish international now on the cusp of a Serie A title in his first season, ...