A viewer's video, shared with "Chicago Tonight," shows his encounter with a coyote in Columbus Park while walking his two dogs. Coyote mating season has begun, which means the urban animals may behave aggressively.

The Cook County Forest Preserve District makes its biggest land purchase in nearly 50 years snapping up a foreclosed 400 acre horse farm in Barrington Hills.  We look at how the Forest Preserve was able to afford the $14.5 million property and what it might become.