Pocket Gamer: Horses: some people ride them, some people groom them, some people breed them, some people eat them. However, the fact remains: we all (read: "I") love horses.
Games developers are aware that we all/I love horses, which is why products like HorseWorld 3D: My Riding Horse exist - to capitalise on our/my great, deep, and unerring LOVE of horses. In this instance, the horses are in 3D, though I doubt it's the stereoscopic kind, and more the mid-'90s "OMG, look how good Quake looks" variety.