Frank Sinatra sang about a mating game in which men and women played their timeless roles.

ECONOMIST: Frank Sinatra

Annoyed by the party crasher at their mating game, at least 100 salmon shot off into the jade water.

BBC: Eyeball to eyeball with Canada��s migrating salmon

Of course, it is a long stretch from showing equal success in a laboratory game to showing it in the mating game that determines evolutionary outcomes.

ECONOMIST: Human evolution

The mating game: Will Frankel and Black Caviar breed superhorses?

CNN: How to pick a winner: Horse racing's 'speed gene' test