Why do frogs have such bulging eyes?

A frog's eyes sit high on the head and protrude outward, giving it an almost panoramic view of its surroundings. This is useful because frogs often wait motionless for insects, so seeing movement from many directions helps them strike quickly and avoid being eaten. The eye position also allows many frogs to press their eyes downward to help swallow prey. In effect, the same anatomy supports hunting, vigilance, and feeding. The design is a good match for a sit-and-wait predator that lives among reeds, ponds, and leaf litter.