Grazing animals’ eyes can rotate by 50 degrees or more in each eye, a range 10 times greater than human eyes, the researchers said. How ambush predators focus when catching prey. For ambush predators ...

Species with horizontally elongated pupils, meanwhile, are more likely to be plant-eating prey species. In such cases, the eyes are commonly on either side of their heads, ...

Sure enough, when goats, antelope and other grazing prey animals put their heads down to eat, their eyes rotated to maintain the pupils’ horizontal alignment with the ground,” he said.

Animals with eyes at the sides of their head, which have horizontally-elongated pupils, are likely to be prey. "Having eyes towards the side of their head helps them to see nearly all around them.