One misty night in the late Cretaceous, the eyes of a Tyrannosaurus rex glow like twin embers. The effect is caused by a structure in the back of each eye called the tapetum lucidum, which helps the predator see even in these dark conditions. Modern crocodilians’ eyes have a structure very much like this one, and it wouldn’t surprise me if dinosaurs inherited their own version of it from the common archosaur ancestor they share with crocs.