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Not all animals have circular pupils. Some have slits or ovals which may be oriented vertically, as in crocodiles, vipers, cats and foxes, or horizontally as in some rays, flying frogs, mongooses and artiodactyls such as elk, red deer, reindeer and hippopotamus, as well as the domestic horse. Goats, sheep, toads and octopus pupils tend to be horizontal and rectangular with rounded corners. Gecko pupils are generally of the shape of a slit with multiple notches, such that when it is closed, the pupil becomes a series of pinholes, and when it is open, the pupil is roughly circular. When a pupil has a slit form, it is sometimes called stenopaic. The cuttlefish pupil is a smoothly curving W shape.