A gorilla is eating bananas and watching for the king cobra that can kill him.
In a New Environment
In the jungle there are two types of gorillas, a black one and a grey one.
In this picture a volcano has erupted and split the land in half. One side of the land cough on fire.
Due to the land splitting the gorillas were forced to move to a much cooler area then before. The black gorillas were more successful here because they absorb more heat then the lighter gorillas. Therefore the black gorillas stay warm easier.
Over time the light gorillas start to die off and the black gorillas population started to increase.
The black gorilla has now became its own species because they refused to mate with light gorillas. So there were only black gorillas being born.