in our sunday morning cover story. reporter: asian carp. mussels from europe. burmese pythons. they re more than making it in america. their numbers are exploding with devastating results. when scientists look into the future, they see the potential for many more damaging species. reporter: you make it sound like we re under attack everywhere. we are under attack everywhere. reporter: invasive species. the natural order completely up in the air. later on sunday morning. osgood: when you see trick or treat at somebody s doorstep you re hoping for something good enough to eat. but what if the house and the doorstep themselves are a trick, a deception by a skilled photographer. martha teichner will show us a master of the art. reporter: no, you re not hallucinating. you re looking at carl warner s edible landscapes. so the sea is made out of little fish. yes. because they have that lovely silver in it and they reflect the sky they just kind of look like water at