Unnatural Selection - How Humans Are Changing Evolution | Free Documentary Nature

Unnatural Selection - How Humans Are Changing Evolution | Nature Documentary Watch 'Evolution - The Creation of our Earth' here: https://youtu.be/nrOHf63k-GA The wings of cliff swallows in Nebraska are getting shorter – while female turtles in Chesapeake Bay are getting larger. On the Galapagos Islands, two species of finches are developing back into one. Increasing numbers of peregrine falcons are living in urban areas – and have adapted their behavior: thanks to the city lights, they have learned to hunt at night. Life emerged three and a half billion years ago and since then has evolved into a dazzling variety of shapes and forms. But humans have transformed our planet beyond recognition – turning grasslands and forests into fields and cities, and polluting the air and water, thus changing the environment of many animals. All of these changes have altered the course of evolution – in some surprising and unexpected ways. The process known as natural selection has now taken on anot