This is the place to see and to be seen in the mustang world. Bands come into the waterhole at a dead run, or at a leisurely sedate pace. It is the chance to show off, particularly for the bachelors (studs) who derive great pleasure in chasing each other around and engaging in sparring. It is a chance for band stallions to demonstrate the fitness of their bands. The bands drink in order of dominance; the more dominant drink first while the subordinate bands, bachelors, and lone horses drink last.
Some scientist theorise that the stallions tolerate their older sons because they act as sentinels and lessen the burden of watching for rivals/or predators. Some band stallions even tolerate mating between their sons and mares in the band. Generally, band stallions drive out the
2-4 year old mares and studs before inbreeding can occur. These groups of bachelors with an occasional filly are found scattered throughout the management areas although lone fillies/mares without a stallion are usually incorporated into other bands. Wayne L. Linklater, Elissa Z. Cameron, Tests for cooperative behaviour between stallions, Animal Behaviour, Volume 60, Issue 6, December 2000, Pages 731-743.