How do wild mustang horses behave?

A horse in the wild will act in much the same way a horse in domestic situations would. They graze for 10 to 20 hours depending on the quality of the forage, while grazing they will intermittently lay down and sleep, nap standing up, go to the water hole to drink, play with their herd mates, possibly breed with a stallion or mare, and always remain watchful of predators.