I have read for several years now about smaller creatures like opossums and raccoons that have been finding easy food in the suburbs, and have gradually been moving closer into the urban areas of towns and cities across the nation; but now, many of the predator species are also moving into the cities and, apparently, thriving there.
Chicago has an estimated 20,000 coyotes living on the downtown streets, and eating the rodents that they catch, as well as garbage they find dumped on the ground.
Other areas have bears that are also becoming used to seeing humans, and are now looking for food and shelter closer to towns. I recently watched a video about a bear that was wandering through a California neighborhood, appearing to be going from house to house, checking out the trash cans at each home.
These predators have greatly multiplied because of conservation efforts to keep people from shooting them; and as a consequence, now we have not only more of the predators, but ones who are no longer afraid of humans.
This lack of fear, combined with the wild animals living in such close proximity to people, is very likely to cause more attacks on humans, and our little pets, as well.
http://researchnews.osu.edu/archive/urbcoyot.htm