A young couple recently took their little boy to the Cheyenne Mountain Zoo in Colorado Springs, Colorado -- and they naturally visited the lions exhibit. Typically, visitors are treated to lions lounging, sleeping, yawning, laying around, sleeping and snoring. But not this time. In this video, we see why they have those six-inch plexiglass walls separating the big cats from the little kids. Trent comes face to face with Angie, a 400-pound lionness.