How Dinosaurs and Mammals Evolved on Planet Earth
by John Agbo, age 14
A long-held belief that dinosaurs suppressed mammals has been debunked. Recent fossil discoveries and new research show that mammals were better off than scientists originally thought.
There was a significant boom in reptile evolution during the Mesozoic Era, which was also when the earliest mammals emerged. Early mammals were small insectivores with big eyes, hinting that they were nocturnal.
It was only after the Cretaceous Period that mammals grew larger than house cats. Most scientists once considered dinosaurs “sluggish, dim-witted, and even freakish," they saw mammals as evolutionary underdogs, painting them as a superior order oppressed by the “tyranny of cold-blooded reptiles,” according to paleontologist and science writer Riley Black. Some scientists think this antagonistic relationship might have contributed to the extinction of dinosaurs. [Read More]