- Cooperative Polyandry Definition: Groups in which two or more males mate with a single female during a single breeding season and collaborate to raise her offspring Expectation of Polygyny and Selfish Behavior Cooperative polyandry seems to fly in the face of expectations in two ways- First of all, males are expected to raise their reproductive success by gaining access to females. Females don't ...www-personal.umich.edu/~phyl/anthro/polyandry.html