The bird appears to breed in groups with one dominant pair helped by the others.

Recent genetic research has confirmed that these dominant pairs are responsible for more than 95% of young hatched.

In this species, the dominant pair are able to leave their dependent young in the care of helpers and initiate a new brood.

The dwarf mongoose lives in a social system with one dominant pair.

In particular, groups form a clear dominance hierarchy where only dominant pairs breed.

Smith moved on to partner with Randy Stoklos, and the two became the most dominant pair in men's beach volleyball.

It is a co-operative breeder, with dominant breeding pair, male helpers and additional females.

The dominant pair made the decision and the pack followed, but I missed the magic moment - the entire pack departed as one dog.

They are social and typically seen in groups, but only the dominant pair are believed to breed, while other group members act as helpers.

The dominant pair in the social hierarchy tend to travel farther from the host anemone in order to find food.