The Przewalski’s horse is the only truly wild horse species still in existence. The only wild population is in Mongolia. There are however numerous populations across the world of feral horses e.g. mustangs in North America.
Horses have near 360 degree vision. They do however have blind spots directly in front and behind them. It is extremely dangerous to stand behind a horse as they are liable to kick out if they get scared by anything as kicking out is their way of defending themselves.
Horses and other equines have better senses of smell and hearing than humans. Their ears can turn in different directions to aid their hearing.
You see the horses ears, well if it does that back away slowly it means it's mad and you should most likely leave it alone., it's scared or it fills like it needs to protect its self.