Cats are everybody's problem. The scale of the carnage (there is no other word) is breathtaking. There is quite a bit of scientific literature available, however the popular press, though more sensationalist, gives a decent picture on how significant the problem is: https://www.washingtonpost.com/national/health-science/outdo... http://www.cbc.ca/news/politics/9-leading-causes-of-bird-dea...
http://www.alleycat.org/document.doc?id=633
http://www.npr.org/sections/13.7/2013/02/03/170851048/do-we-...