The first key visual requirement(ความต้องการ) for these animals(สัตว์) is to detect(ค้นหา) approaching predators(ผู้ล่า), which usually come from the ground(พื้นดิน), so they need to see panoramically on the ground(พื้นดิน) with minimal blind spots(จุด)," said(กล่าว) Banks. "The second critical requirement is that once they do detect(ค้นหา) a predator, they need to see where they are running(วิ่ง). They have to see(ต้องไปดู) well enough(พอ) out of the corner(มุม) of their eye(ตา) to run quickly and jump(กระโดด) over things(สิ่งต่างๆ).