noun / verb
huddle
HUD-uhl/hˈʌdʌl/
A close gathering of people, or gathering closely together.
The three people huddle with shoulders close and heads inclined inward.

Etymology
Huddle probably comes from a verb for covering or sheltering, used of hens with chicks or nurses with children. Its early English meaning “heap or crowd together” connects that protective closeness with a close gathering.
In context
The high-ranked females form their exclusive huddle. For the lower ranked, bedtime is often more of a solitary affair.