Excerpt from the July 22, 1972 issue of Science News
Fifty years ago, scientists thought dinosaurs’ warm blood or soft eggs may have caused the reptiles to die out (illustration of a partially buried dinosaur skeleton shown). Now, mounting evidence points to a killer asteroid impact.
Dinosaurs might have been endothermic, or warm-blooded…. The combination of large size, endothermy and naked skin may explain the extinction of dinosaurs.
About 65 million years ago there was a sharp drop in temperature….
Dinosaurs, lacking skin insulation and too large to burrow underground … could not survive.
Meanwhile, evidence has come that … the shells [of their eggs] became progressively thinner … too fragile to support the growing embryo.
Source: sciencenews.org
