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Dinosaur To Bird Essay

709 words - 3 pages

There is a strong amount of evidence in science to suggest that birds evolved from small theropod dinosaurs. To start on a common ground, natural selection must be understood. This is the process by which genetic mutations that enhances reproduction become and repeat more often in later generations (adapting them), eventually leading to evolutionary change. Since animals produce too many offspring, competition in the environment levels things out, creating a change in generations through favoring of traits. For this case, there were tons of dinosaurs of all different shapes, sizes, and colors living on the earth. In particular, there was one group that stood out among the rest, evolving ...view middle of the document...

It started out as a fluffy insulation mechanism and way to keep their eggs warm, but soon found a new purpose. As their bodies and bones kept lightening up and wing feathers grew longer, they began to take flight. It started out as just little hops and glides to keep them out of danger but eventually natural selection took a hint and kept choosing the traits that helped them stay in the air longer.
Size played a huge factor in which dinosaurs survived and which didn’t. Since the smaller theropds had more chances to experiment with different genes to test which ones were more favorable, their adaptions arose more quickly than in larger dinosaurs. The slow-adapting dinosaurs got trapped in small ecological niches causing them to die out. It was mostly the smaller theropods that evolved to the birds we know today, because of their light weight allowing them to fly. Their bone walls became thinner and even their eggs became smaller.

Not only did the dinosaur's structure change to make it lighter in flight, but also its egg size.
The size and shape of it become smaller and more oval like a modern...

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