The animals which are colonial show dominance.
In this behaviour one or, more members dominates others by aggression or, threat is called dominance.
The dominants always get Priority for better food, place, mate & other requirements, Factors of dominance is social rank within the group as a result of age & experience as well as anatomical & Physiological capabilities. Usually older dominants over younger, larger to smaller, male to female & healthier to weaker ones with few exception.
Example – In Lemur & dog, female dominants over male during breeding season.
The different animals express their dominance in a group differently.
Eg – Cattle and other hoofed mammals show series of threats by pawing the ground, butting of heads, sporing & making sounds of different sorts,
Sometimes dominance is established by actual fighting. Mouse vibrates its tail when meets another mouse. Later on one of the mice will recognize the dominants & retreat itself.
The dogs threat others by snoring, posing their teeth etc. The dominated one moves away by lowering the tail.
An unique type of dominance can be seen in wild baboon. When there group is dominated by a small number of males who depend on are another to dominate the rest