|Researchers have unearthed fossils of an extinct spider family that contain reflective materials once contained inside the arachnids' eyes. When a light is shined upon the fossils, the eyes of the fossilized spiders still shimmer.|
Structures like these can be found in many creatures alive today, typically among nocturnal predators like cats and dogs, but also among bovine and deep sea fish.
|The fossils were unearthed from an area of Korean shale known as the Jinju Formation, and are dated from between 110 and 113 million years ago.|
The extinct family of spiders were clearly common in the Cretaceous.