Horses are naturally highly social animals. A normal healthy horse would never live alone by choice. When horses live in a herd situation (either in the free living or domestic state) they have a rich and varied social life that includes activities such as play behaviour and mutual grooming behaviour, And this is the most interesting thing about horse, Horses have what’s called a “stay-apparatus” which is a system of tendons and ligaments that allows the horse to lock their legs in position so they can relax without falling over. When not sleeping, horses also use this apparatus to rest while standing for long periods of time so they don’t fatigue. This allows them to conserve energy while standing so they are ready to take flight if needed. But it is a myth that horses never lay down – they do spend a short amount of time each day laying down for deeper sleep. Isn't it cool?