Horses have adapted by developing a survival instinct in which they readily identify threats and flee, rather than fight. A long neck allows a horse to feed on grasses without having to lie down and gives it a visual advantage that helps it to detect danger.
A horse’s nose has large nostrils that can pick up scents easily and its large ears are sensitive to sound. Horses also have big eyes that are able to readily detect movement.
Horses live in many different environments and climates and have evolved to adapt. As climate changes caused plants to become tougher and taller, a horse’s teeth evolved into molars that were more suitable for grazing, grinding and chewing. Some horse breeds have adapted to colder seasons by growing a thicker coat and have tougher hooves that can maneuver more rocky terrains.