Our oldest known vertebrate ancestors had four eyes to spot predators — and, my goodness, they were cute.
Rare fossils from China have revealed that the earliest recorded creatures with spines — jawless fish from half a billion years ago — were equipped with two sets of peepers. Researchers have released an adorable reconstruction of one such four-eyed noodle as part of a study that described the two pairs of eyes, which were surprisingly advanced for their time.
