Changes to landscapes due to human activities can affect scavengers. Power line towers in relatively treeless sagebrush ecosystems are preferred nesting sites for ravens, birds which are both predators and scavengers. The addition of these artificial nesting locations appears linked to the raven’s increased abundance in these ecosystems over recent decades. For more on this, check out http://www.sciencedaily.com/releases/2014/08/140811132302.htm