why do birds have eyes on either side of their head
Bird vision Most birds cannot move their eyes, although there are exceptions, such as the great cormorant.[3] Birds with eyes on the sides of their heads have a wide visual field, useful for detecting predators, while those with eyes on the front of their heads, such as owls, have binocular vision and can estimate distances when hunting.[4] The American woodcock probably has the largest visual field of any bird, 360° in the horizontal plane, and 180° in the vertical plane.[5]
Fly mask A fly mask or fly cap is a mask used on horses to cover the eyes, jaw, and sometimes the ears and muzzle to protect from flies. The mask is semi-transparent and made from a mesh allowing the horse to see and hear while wearing it. The mask may also provide some protection from UV-light and some are treated with insect repellent.[1] Fly and mosquito protection is an important part of overall horse care, as biting insects are both a source of irritation and also may transmit disease.[further explanation needed]