21. It may be a shorthand reference for a dominance hierarchy . 22. Such interactions created a dominance hierarchy headed by individuals with the greatest ovarian development. 23. None of the studied populations show dominance hierarchies and aggression tends to be low. 24. When a Queen dies the next Queen is selected by an age based dominance hierarchy . 25. The harem males suppress aggression between the females and prevent any dominance hierarchies from arising. 26. These increased levels of cortisol possibly correlate with size determining rank within the dominance hierarchy . 27. These sheep live in large flocks, and dominance hierarchies are often restructured each breeding season. 28. Groups include members of both sexes, including juveniles, and there are no discernible dominance hierarchies . 29. Males are often aggressive towards one another, creating a strict dominance hierarchy within the burrow. 30. There are no dominance hierarchies among the females, and the females do not form coalitions.
