Goggle eyes

时间:2019-03-07 09:16:05166网络整理admin

THE monstrous eyes of ichthyosaurs, the giant reptiles that flourished in the oceans of the Jurassic period, evolved to allow the creatures to find fish in very deep, dark waters, according to researchers in the US. Their eyeballs could grow to as much as 22 centimetres in diameter—the largest known for any vertebrate—an adaptation which probably helped them to see in the depths of the ocean, where very little light penetrates. The researchers, led by Ryosuke Motani of the University of California Museum of Paleontology, Berkeley, have found that the bones of these tuna-shaped animals also bear signs of caisson disease, better known as “the bends”. This also suggests that ichthyosaurs dived to depths of up to 600 metres in search of food, say the scientists (Nature, vol 402,