According to scientists who maintain that dinosaur extinction came quickly, the impact must have spelled the cataclysmic end. For months, scientists conclude, dense clouds of dust blocked the sun ...

By contrast, ectothermic, or cold-blooded, animals have much lower metabolic rates and typically rely on external sources of heat, such as the sun, to raise body temperature. Dinosaurs are popularly ...

The influence of such large dinosaurs was so vast on the environment that after their extinction, forests grew back thicker, ...