Evolution works extremely slowly. You have to expect serious trouble if you radically change an animal’s evironment. For humans, we have cut walking from  per day day to 0. We have radically changed our diet. We have changed from living in small groups to living in giant hives called cities. We have introduced thousands of toxic chemicals. We have changed from living outdoors to living inside.
~ Roedy (born: 1948-02-04 age: 62)