To achieve REM sleep horses need to lie flat out on their side with their legs outstretched. Horse owners often have a momentary panic when seeing their horse in this state when they haven't responded to their call.
Read MoreEver wondered what your horse gets up to in his stable? This fascinating film shows 8hrs in the life of a stabled horse via time lapse camera, condensed into 8 minutes.
Read MoreInteresting film of a horse's reaction to seeing her own reflection. She is clearly confused and goes to look behind the mirror to see where the 'other horse' is.