A friend just sent me this link which I found interesting:
http://m.livescience.com/51762-why-do-sheeps-and-horses-have-elongated-pupils-video.html
Are you perceptive enough to have noticed the change in position of the pupil? I hadn’t… maybe because when I’m eye-to-eye with my horse, his head is in one typical position? Off to the barn to raise and lower my horse’s head and see the effect in action…