Inability to adapt

Some animals are not able to adapt and that is the main for extinction. There are many times when it has happened in our world. The whale once walked on land and now it adapted. With global warming the Polar bear is going to have to adapt or it will die off. If 100 chickens moved to the northern part of Canada they probably would not survive. Out of all the animals I bet some time in their life they had to adapt sometime. Wrong animals in wrong places lead to extinction. These are just some way explaining extinction.